Gold Bull Resources Corp. (TSX-V: GBRC) (“
Gold
Bull” or the “
Company”) is pleased to
report its initial Abel Knoll Bottle Roll Leach Test work conducted
in September 2021 at its 100% owned Sandman Project
(“
Sandman” or the “
Project”)
located in Humboldt County, Nevada, USA.
HIGHLIGHTS & UPDATE:
- Abel
Knoll Bottle Roll Leach Test work returned an average of 88%
extracted (recovered) gold from oxide material with a maximum of
97% extracted gold
- Results
are consistent with prior historical tests completed by Newmont at
Silica Ridge and South East Pediment and Kennecott’s test work at
North Hill, Silica Ridge and Southeast Pediment
- These
are preliminary tests and further optimisation work is planned for
mine studies
- Upside
in extracted silver value identified and not included in current
resource estimate
- Oxide
ore extends down to 201m at Abel Knoll which is very encouraging
for gold oxide recovery
- 2021
drill holes at Abel Knoll included:
- SA-0001
intersected 144.8m (475 ft) at 1.58g/t Au from 65.5m (215 ft) which
included 97.5m at 2.06g/t Au from 96m and 6.1m @ 7.77g/t Au from
143.3m
- SA-0031
intersected 90 m (295 ft) at 0.6 g/t Au from 76.2 m (outside the
current resource)
-
Southeast Pediment yielded 92.5% extracted gold with
gravity concentration and 85.8% extracted gold without gravity
concentration (historically)
Gold Bull CEO, Cherie Leeden commented:
An average of
88% gold recovering from Abel Knoll without doing any metallurgical
optimization work is exceptional. We focussed our study on Abel
Knoll because there had not been previous metallurgical work done
on that deposit yet we had some impressive drill hits at Abel Knoll
this year. These excellent metallurgical gold recoveries are very
similar to the historical metallurgical recovery data we inherited
for our other three deposits (North Hill, Silica Ridge and
South-East Pediment). Additional optimization metallurgical work is
planned for next year, that will feed into a feasibility
study.
Background
Bottle Roll Leach Test work results
Gold Bull submitted 24 samples to Kappes,
Cassiday & Associates (KCA) metallurgy laboratory in Reno,
Nevada in September 2021 to provide preliminary test work of gold
recovery for the Abel Knoll deposit as no prior metallurgical work
had been completed at this ore deposit. The oxide sample results
are very encouraging with an average of 88% gold extracted and
maximum recovery 97% from the oxide sample material. These are
preliminary test work results, and no optimisation work has been
completed.
The gold recovery results are similar to
Newmont’s prior test work completed at Southeast Pediment and
Silica Ridge and Kennecott’s prior work at North Hill, Silica Ridge
and Southeast Pediment.
The 24 samples were sourced from the Abel Knoll
ore deposit and comprised composite reverse circulation samples
sourced from a range of deposit depths, lithology and oxidation
states. A wide range of mineralised samples were submitted to test
the variation of the deposit results in oxide, transitional and
sulfide ore horizons over varying depths. The sample material was
utilized exclusively for Bottle Roll Leach Test work. The analysis
including preparation, assaying and metallurgical studies utilizing
accepted standard industry procedures and a specialist experienced
metallurgical laboratory KCA.
The maximum percentage gold extracted was 97%
gold with an average of 73% over all of the oxide, transitional and
sulfide ore horizons. The results reflect with the presence of
sulphide in sample materials which reduces leach recovery where the
oxide and oxide transitional samples returned encouraging results
>80% gold extracted and those from fresh rock with sulfide
returned lower results as anticipated from this type of leach test
work.
Figure 1. Map showing location of the mineral resources at
Sandman.
Gold extraction for the nine oxide
samples averaged 88% and ranged from 80% to 97% extracted
gold. Gold extraction for the six samples listed as
sulfide material averaged 64% with maximum 91%. Gold extraction for
the nine samples comprising transitional oxide-sulfide material
averaged 65%. These results collectively show a general trend
transitioning from oxide to deeper fresh sample material which is
considered normal for bottle roll leach test work. All three holes
tested show a gradual decrease in leach gold extraction with depth
as the material transitions from oxide to deeper sulfide ore. Oxide
ore extends from surface to a depth of 201m (660 feet) in the
western Abel Knoll diatreme breccia and ranges from 53m (175 feet)
to 80m (265 feet) depth from surface in the eastern portion of the
deposit.
A summary of GBRC’s bottle roll leach test work results are
summarised in the table below.
Sandman Project - Abel
KnollSummary of Cyanide Bottle Roll Leach Tests -
Gold
Table 1 Abel Knoll preliminary test work results from
cyanide bottle roll leach test work with gold extracted in
percentage reported by KCA laboratory
The Abel Knoll deposit has low levels of silver and Gold Bull’s
Bottle Roll Leach Test work returned an average of 24% extracted
silver with maximum 63%. Those samples with higher silver
extractions were sourced from the higher grade non oxide materials.
These test results are indicative only and have not been
optimised.
Sandman Project - Abel Knoll Ore
DepositSummary of Cyanide Bottle Roll Leach Tests
- Silver
Table 2 Abel Knoll preliminary test work results from
cyanide bottle roll leach tests with gold extracted in percentage
reported by KCA laboratory
The graph below shows the extracted gold within
oxide material returning consistently higher gold recoveries
(orange) compared to transitional material (light grey) and sulfide
material (dark grey). The two samples returning >80% extracted
gold from the sulfide material are likely to form part of the
transitional material given this is a preliminary test to determine
the range of leach recoveries for the Abel Knoll deposit.
Sandman Project - Abel Knoll Ore
DepositGold Extraction v’s oxide to fresh
ore
Graph 1. Graph depicting extracted gold in
percentage per material type. Samples are colour coded with
orange showing oxide extracted gold, light grey being transitional,
and dark gray sulfide extracted gold.
The graph below shows the extracted gold over
the depth of intermittent composite samples from surface in hole
SA-001 and indicates the general tapering of extracted gold with
depth from 70 to 210m (240 to 680 feet). The oxide boundary of the
diatreme breccia in the west of the ore deposit is deep at 201m
(660 feet) from surface and the eastern stratigraphic oxide
boundary ranges from 53m (175 feet) to 80m (265 feet) depth from
surface. The extracted gold oxide material test work results are
very encouraging given the depth of the diatreme breccia at 201m
(660 feet) is deep.
Graph 2. Graph depicting extracted gold in hole
SA-0001 with depth in feet, there is a gradational trend of
reducing extracted gold where the oxide and transitional materials
return higher leach recovery compared to the deeper sulphide
ore.
Bottle Roll Leach Test Work Process
The objective of the Bottle Roll Leach Test work
was to test the variability of gold recovery on a range of ores,
including variability of gold recovery from oxide to sulfide ores
sourced from different depths of the Abel Knoll deposit. No prior
test work has been conducted from the Abel Knoll deposit.
- A range of
composite sample intervals were selected to test variation of gold
recovery and other parameters including oxidation state driven by
geology factors and depth from surface, geological variation with
regards to host rocks including Tertiary Diatreme, Tertiary and
Basement rocks as well as alteration and the presence of sulfides
in fresh rock. A range of variable oxide materials were selected
with samples sourced from oxide, transitional and
transitional/sulfide ore horizons. Hole SA-0001 is included in the
Abel Knoll Mineral Resource Estimate (MRE) while SA-0031 and
SA-0033 are new holes and are not included in the existing Abel
Knoll MRE and are resource extensions of the Abel Knoll MRE.
- Samples for the
bottle roll test work were sourced from composite reverse
circulation samples taken during Gold Bull’s 2021 exploration
drilling program and were initially analysed for gold and
multi-element geochemistry at American Assay Laboratory (AAL) in
Reno, Nevada. The samples were jaw and roll crushed by AAL to 10
mesh (2mm) and composited per down hole interval with 24 samples
submitted to KCA laboratory.
- Each sample
received at KCA was weighed, blended and split using a Jones Riffle
splitter to create a 500-gram portion of the composite sample to be
utilised for the Bottle Roll Leach Test work.
- Bottle Roll
Leach Test work was completed on the as-received composite samples
at KCA with the addition of Leachwell. Leachwell was used as a
catalyst to increase the kinetics of the leach. The Leachwell
product used does not contain cyanide.
- KCA tail assays
for gold were ran as one assay ton (1AT) or 30-gram fire assay by
standard fire assay methods with gravimetric or flame atomic
absorption spectrophotometric (FAAS) finish. Tail assays for silver
were ran as one assay ton (1AT) or 30-gram fire assay by standard
fire assay method with gravimetric finish or through a four acid
digestion of a 0.25 to 0.50 gram sample with FAAS finish.
- The Bottle Roll Leach Test work
procedure comprised the following.
- One 500 gram
split of as received material was placed into a 3.5-liter bottle
and slurried with additional tap water to a total of 750
milliliters of added water.
- The slurry was
mixed thoroughly, and the pH of the slurry checked. The pH of the
slurry was adjusted, as required, to greater than 10.5 with
hydrated lime.
- Sodium cyanide
was added to the slurry to a target amount of 2.0 grams per litre
sodium cyanide. Leachwell was added to the slurry to a target
amount of 20 grams per litre Leachwell. The bottle was then placed
onto a set of laboratory rolls. Rolling throughout the duration of
the test mixed the slurry (15 rpm).
- After 24 hours
of continuous rolling, the slurry was checked for pH, dissolved
oxygen (DO), NaCN, Au, Ag and Cu.
- The slurry was
then filtered, washed, and dried.
- From the dry
tailings, duplicate portions were split out and individually ring
and puck pulverized to 80% passing 0.075 millimetres. The
pulverised portions were then assayed for residual gold and silver
content.
- The test work
was conducted with reagent grade hydrated lime for pH control. The
Parameters of the Bottle Roll Tests are summarised in the table
below.
Sandman Project - Abel
KnollParameters of Bottle Roll Tests by
KCA
Table 3. Parameters of Bottle Rolle tests
completed by KCA for Gold Bull in September 2021
Summary of Sample Materials
Samples received by KCA for the cyanide Bottle
Roll Leach Test work were sourced from Abel Knoll reverse
circulation drilling chips from holes SA-0001, SA0031 and SA-0033.
The table below provides a summary of materials selected for the
test work. The average sample weight was 1,200 grams with minimum
1,119 grams and maximum 1,283 grams. Some variation of gold grades
reported by AAL and KCA are evident of the coarse gold nugget
effect at Abel Knoll which has previously been studied at
Sandman.
Sandman Project - Abel Knoll Ore
DepositSummary of Received Samples at
KCA
Table 4. Summary of samples submitted to KCA for Bottle Roll
Test work including geology, rock type, redox, % sulfide,
alteration and AAL grade in which samples were selected. Note: The
Composite ID nomenclature includes drill hole prefix SA-0001,
SA0031 and SA0033 as well as the down hole foot depth of the
reverse circulation composite sample depth e.g. 220-240 foot in the
first line is the down hole composite sample depth.
HISTORICAL METALLURGICAL TEST RESULT SUMMARY: FOR
SOUTHEAST PEDIMENT, SILICA RIDGE AND NORTH HILL
This section discusses the historical Bottle Roll Testwork at
the Sandman deposit, all of the testwork was preliminary and has
not been optimised. Most of the samples were taken from reverse
circulation drill chips and drill core and early work from
trenches.
The draft below provides the location of testwork relative to
Sandman Mineral Resource Estimate (MRE) boundaries.
Figure 2. Map showing location of Abel Knoll Bottle Roll Leach
testwork locations as well as the locations for all historical
sample materials from Southeast Pediment, Silica Ridge and North
Hill relative to Sandman’s MRE.
North Hill and Silica Ridge – Newmont’s Historical Test
Results
Newmont conducted Bottle Roll Leach Test work at
Southeast Pediment and Silica Ridge. Their preliminary test work
was not optimised and concluded the following:
- Southeast
Pediment and Silica Ridge ore deposits contain material which can
be classified as free milling ores.
- Results at
Southeast Pediment yielded 92.5% extracted gold with gravity
concentration using material 80% passing 200 mesh grind (0.075mm)
and 85.8% extracted gold without gravity concentration. The Carbon
in Leach (CIL) did not significantly improve the test results nor
the additional of elevated cyanide. Their recoveries increased with
increasing head grade.
- Results at
Silica Ridge which included low grade samples yielded 85.1%
extracted gold with gravity concentration using material 80%
passing 200 mesh grind (0.075mm) and 80.4% extracted gold without
gravity concentration. Gold recovery averaged 89.9% extracted gold
without gravity concentration for material which graded between
0.03-0.2 ounce per tonne gold and 94.8% extracted gold for material
which graded above 0.2 ounce per tonne gold suggesting the higher
the gold grade the better the recovery.
Southeast Pediment - Newmont’s Historical Test
Results
Newmont’s test work material comprised 80%
passing -200 mesh (0.074mm) with 24 hour leach returning an average
of 85.75% extracted gold. Selected materials comprised majority
oxide as well as transitional and sulfide ore to test the
variability of results from the deposit, maximum recovery was 97%
and minimum 75.79% demonstrating relatively consistent results over
a range of variable oxidation materials. No flow sheet optimisation
test work was conducted and these were preliminary tests from
diamond core samples. Addition of the gravity concentration step
improved recovery for samples >90% extracted gold. Results for
Newmont’s Southeast Pediment Ore deposit preliminary variability
test work are provided in the table below.
Newmont’s Historical Test
ResultsSoutheast
Pediment -
initial bottle
roll results24 hr Leach, 80%
passing 200 mesh
Hole# |
Intervals |
Ore Type |
Sample ID |
Avg. Au opt |
80% Grind/Leach |
NaCN, lb/t |
Lime, lb/t* |
NSM-00004 |
66.3-74.9 |
Oxide |
Comp 1 |
0.077 |
79.81 |
1.94 |
1.2 |
NSM-00004 |
80.2-89.0 |
Oxide |
Comp2 |
0.064 |
79 |
1.96 |
1.4 |
NSM-00004 |
104.4-114.5 |
Oxide |
Comp3 |
0.047 |
82.98 |
1.94 |
1.31 |
NSM-00004 |
124.0-129.5 |
Oxide |
Comp4 |
0.266 |
78.99 |
1.94 |
1.33 |
NSM-00007 |
113.6-118.3 |
Oxide |
Comp5 |
0.38 |
75.79 |
1.94 |
1.34 |
NSM-00010 |
97.1-102.5 |
Trans |
Comp6 |
0.054 |
85.18 |
1.95 |
1.46 |
NSM-00010 |
79.0-82.7 |
Oxide |
Comp7 |
0.085 |
88.29 |
1.94 |
1.38 |
NSM-00010 |
114.5-117.6 |
Oxide |
Comp8 |
0.123 |
86.16 |
1.95 |
1.09 |
NSM-00010 |
127.6-129.2 |
Oxide |
Comp9 |
0.137 |
88.66 |
1.94 |
0.97 |
NSM-00010 |
138.2-141.0 |
Oxide |
Comp 10 |
0.183 |
83.1 |
1.94 |
1.29 |
NSM-00010 |
512.4-519.9 |
Sulf 1% |
Comp 11 |
0.043 |
82.87 |
2.94 |
1.66 |
NSM-00009 |
89.0-93.3 |
Oxide |
Comp 12 |
0.179 |
89.4 |
1.96 |
1.29 |
NSM-00009 |
110.0-112.0 |
Oxide |
Comp 13 |
0.505 |
94.75 |
1.94 |
1.25 |
NSM-00009 |
123.0-128.2 |
Sulf 2% |
Comp 14 |
0.071 |
79.51 |
2.97 |
0.68 |
NSM-00024 |
113.2-127.4 |
Ox Leach |
Comp 15 |
0.037 |
85.22 |
1.94 |
1.5 |
NSM-00024 |
160.0-165.0 |
Oxide |
Comp 16 |
0.048 |
88.42 |
1.96 |
2.29 |
NSM-00031 |
82.5-102.9 |
Ox Leach |
Comp 17 |
0.062 |
93.51 |
1.96 |
2 |
NSM-00019 |
69.8-74.0 |
Oxide |
Comp18 |
0.03 |
74.74 |
1.94 |
1.55 |
NSM-00019 |
76.6-79.7 |
Oxide |
Comp19 |
0.738 |
95.94 |
1.95 |
1.5 |
|
154.3-164.0 |
|
|
|
|
|
|
NSM-00017 |
171.1-177.1 |
Oxide |
Dup #1 |
0.263 |
95.59 |
1.47 |
2.62 |
|
154.3-164.0 |
|
|
|
|
|
|
NSM-00017 |
171.1-177.1 |
Oxide |
Dup#2 |
0.251 |
94.67 |
1.65 |
2.5 |
NSM-00017 |
177.1-193.5 |
Ox Leach |
Col#1 |
0.011 |
71.98 |
1.05 |
1.08 |
NSM-00033, |
48.9-95.4, |
|
|
|
|
|
|
NSM-00015 |
179.9-205.5 |
Ox Leach |
Col#2 |
0.028 |
94.37 |
0.88 |
1.82 |
NSM-00017 |
69-85.4 |
Oxide |
Col#3 |
0.076 |
96.92 |
1.58 |
3.04 |
NSM-00026, |
203.3-224.5 |
|
|
|
|
|
|
NSM-00033, |
95.4-125.3 |
|
|
|
|
|
|
NSN-00015 |
149.0-179.9 |
Ox Leach |
Col#4 |
0.013 |
76.78 |
1.35 |
2.27 |
NSM-00033, |
48.9-95.4 |
|
|
|
|
|
|
NSM-00015, |
179.9-205.5 |
|
|
|
|
|
|
NSM-00026, |
203.3-224.5 |
|
|
|
|
|
|
NSM-00033, |
95.4-125.3 |
|
|
|
|
|
|
NSN-00015 |
149.0-179.9 |
Ox Leach |
Col#5 |
0.019 |
86.81 |
0.93 |
2 |
Average |
85.75 |
1.84 |
1.61 |
* Caustic
soda actual pH modifier, value is time equivalent |
Table 5. Summary of Newmont’s Southeast Pediment preliminary
Bottle Roll Leach Test work sourced from Newmont’s historical
files.
Cyanide and Lime consumptions were 1.84 lb/st
and 1.61 lb/st, respectively.
Summary of Newmont’s variability test work for
the Southeast Pediment Bottle Roll Test work is summarised below.
The results indicate gravity concentration improved the extracted
of gold from 85.9% to 92.53% and that Carbon in Leach (CIL) and
additional cyanide did not yield significantly improve results.
Newmont’s Historical Test
Results
Southeast
Pediment -
initial bottle
roll results
Sample ID |
1.5 inch BR Leach* |
80% Grind/Leach |
80% Grind/Grav/Leach |
80% Grind/CIL Leach |
80% Grind/Grav/CIL Leach |
80% Grind/Leach @ high CN |
Comp1 |
81.69 |
79.81 |
96.77 |
|
|
|
Comp2 |
82.2 |
79 |
94.64 |
|
|
|
Comp3 |
92.03 |
82.98 |
97.38 |
|
|
|
Comp4 |
83.85 |
78.99 |
76.1 |
|
|
|
Comp5 |
69.69 |
75.79 |
96.7 |
|
|
|
Comp6 |
69.22 |
85.18 |
93.08 |
|
|
|
Comp7 |
82.76 |
88.29 |
79 |
|
|
|
Comps |
79.27 |
86.16 |
96.15 |
|
|
|
Comp9 |
78.53 |
88.66 |
84.08 |
|
|
|
Comp 10 |
72.49 |
83.1 |
97.22 |
82.36 |
|
|
Comp 11 |
29.17 |
82.87 |
97.22 |
89.4 |
|
|
Comp 12 |
71.36 |
89.4 |
96 |
94.75 |
|
|
Comp13 |
64.89 |
94.75 |
97.86 |
|
|
|
Comp 14 |
36.17 |
79.51 |
87.71 |
|
|
|
Comp15 |
56.07 |
85.22 |
86.25 |
|
|
|
Comp 16 |
25.15 |
88.42 |
90.72 |
|
|
|
Comp17 |
71.24 |
93.51 |
90.69 |
|
|
|
Comp18 |
71.6 |
74.74 |
96.7 |
|
|
|
Comp19 |
55.26 |
95.94 |
98.24 |
|
|
|
Dup#1 |
|
95.59 |
95.76 |
92.74 |
86.74 |
94.99 |
Dup#2 |
|
94.67 |
94.92 |
93.73 |
91.46 |
94.96 |
Col#1 |
|
71.98 |
|
|
|
|
Col#2 |
|
94.37 |
|
|
|
|
Col#3 |
|
96.92 |
|
|
|
|
Col#4 |
|
76.78 |
|
|
|
|
Col#5 |
|
86.81 |
|
|
|
|
*Average, |
|
|
|
|
|
|
1/2" vs. 200 mesh |
66.98 |
84.86 |
|
|
|
|
Avg without vs. with Grav |
|
85.84 |
92.53 |
|
|
|
Avg without vs. with CIL |
|
89.13 |
|
90.6 |
|
|
Avg with CIL w/wo Grav |
|
95.13 |
95.34 |
|
89.1 |
|
Average vs. elevated NaCN |
|
95.13 |
|
|
|
94.98 |
Table 6. Summary of Newmont’s Southeast Pediment
preliminary Bottle Roll Leach Test including gravity, CIL and
additional cyanide test work sourced from Newmont’s historical
files.
Silica Ridge - Newmont’s Historical Test
Results
Newmont’s test work for Silica Ridge was similar
to the test work conducted at Southeast Pediment with materials
tested for oxide, transitional and sulfide ores over a range of
depths and selected geology to determine the range of results.
Newmont’s tested material comprised 80% passing -200 mesh (0.074mm)
with 24 hour leach yielding an average of 82.5% extracted gold for
all materials analysed and maximum gold extracted 97.85%. The
higher-grade recovery for Silica Ridge was improved compared to
Southeast Pediment likely due to inclusion of lower grade material
in the Southeast Pediment test work, Newmont found the best
recoveries were achieved from the higher gold grade materials.
Newmont’s Historical Test
Results
Silica Ridge
- initial bottle
roll results24 hr Leach, 80%
passing 200 mesh
Hole# |
Intervals |
Ore Type |
Sample ID |
Expected Avg. Au opt |
Actual Avg. au opt |
80% 200# Grind/Leach |
NaCN, lb/t |
Lime, lb/t |
NSM-00042 |
123.3-133.8 |
Oxide |
Comp 1 |
8.019 |
0.218 |
93.54 |
1.15 |
1.24 |
NSM-00044 |
95.0-99.1, 121.6-127.6, 139.1-144.2 |
Oxide |
Comp2 |
0.423 |
0.334 |
95.33 |
0.97 |
1.63 |
NSM-00051 |
389.0-399.7 |
Oxide |
Comp3 |
0.524 |
0.566 |
90.18 |
0.76 |
1.09 |
NSM-00051 |
399.7-441.0 |
Oxide |
Comp4 |
0.049 |
0.057 |
77.81 |
1.14 |
0.98 |
NSM-00069 |
118.7-131.1 |
Oxide |
Comp5 |
1.217 |
1.049 |
97.85 |
0.64 |
1.25 |
NSM-00076 |
110.8-120.0 |
Oxide |
Comp6 |
0.081 |
0.052 |
94.5 |
0.8 |
1.14 |
NSM-00102 |
41.9-68.0 |
Oxide |
Comp7 |
0.01 |
0.009 |
78.51 |
0.55 |
0.9 |
NSM-00102 |
68.0-95.8 |
Oxide |
Camp8 |
0.036 |
0.047 |
88.5 |
1.08 |
1.36 |
NSM-00102 |
95.8-135.5 |
Oxide |
Comp9 |
0.008 |
0.01 |
27.37 |
1.05 |
0.98 |
NSM-00104 |
22.4-38.6 |
Oxide |
Comp 10 |
0.251 |
0.242 |
94.8 |
1.12 |
0.86 |
NSM-00105 |
0-26.2 |
Oxide |
Comp 11 |
0.06 |
0.066 |
93.32 |
0.81 |
1.34 |
NSM-00105 |
50.2-81.5 |
Oxide |
Comp 12 |
0.008 |
0.008 |
69.24 |
0.84 |
0.77 |
NSM-00106 |
73.0-100.6 |
Oxide |
Comp 13 |
0.009 |
0.011 |
80.55 |
1.15 |
0.58 |
NSM-00106 |
116.2-153.0 |
Oxide |
Comp 14 |
0.212 |
0.265 |
97.15 |
0.85 |
1.74 |
NSM-00106 |
153.0-183.0 |
Oxide |
Comp 15 |
0.012 |
0.019 |
79.27 |
1.19 |
0.48 |
NSM-00111 |
141.0-143.0, 145.4-161.0 |
Oxide |
Comp16 |
0.01 |
0.01 |
68.49 |
1.01 |
1.54 |
NSM-00111 |
163.3-196.7 |
Oxide |
Comp 17 |
0.013 |
0.012 |
74.69 |
0.78 |
1.04 |
NSM-00111 |
201.7-290.0 |
Oxide |
Comp 18 |
0.015 |
0.Q16 |
70.2 |
0.76 |
1.62 |
NSM-00111 |
290.0-339.7, 343.7-351.9 |
Oxide |
Comp 19 |
0.013 |
0.011 |
79.12 |
1.24 |
1.61 |
NSM-00111 |
351.9-366.0 |
Oxide |
Comp 20 |
0.039 |
0.043 |
89.98 |
1.5 |
0.99 |
NSM-00111 |
366.0-384.8 |
Oxide |
Comp 21 |
|
0.026 |
52.46 |
1.58 |
1.47 |
NSM-00111 |
384.8-391.8, 393.5-405.6, 409.0-412.4 |
Oxide |
Comp 22 |
|
0.01 |
69.96 |
1.57 |
0.88 |
NSM-00112 |
6.0-22.4 |
Oxide |
Comp23 |
|
0.014 |
92.42 |
1.16 |
0.82 |
NSM-00112 |
124.9-217.7 |
Oxide |
Comp 24 |
|
0.011 |
74.03 |
1.51 |
1.28 |
NSM-00105 |
0·26.2 |
Oxide |
Column 5 |
|
0.072 |
95 |
0.5 |
1.68 |
NSM-00123 |
29.3-161.1 |
|
|
|
|
|
|
|
NSM-00123 |
12.5·183.5 |
|
|
|
|
|
|
|
NSM-00136 |
40.9·49.1 |
|
|
|
|
|
|
|
NSM-00102 |
41.9-135.5 |
Oxide |
Column 6 |
|
0.018 |
95.7 |
0.49 |
1.13 |
NSM-00106 |
153-183 |
|
|
|
|
|
|
|
NSM-111 |
141-161 |
Oxide |
Column 7 |
|
0.018 |
89.1 |
0.96 |
1.57 |
NSM-111 |
201.7-384.4 |
|
|
|
|
|
|
|
NSM-112 |
6-22.4 |
|
|
|
|
|
|
|
NSM-117 |
25-33.2 |
|
|
|
|
|
|
|
NSM-117 |
48-55.5 |
|
|
|
|
|
|
|
NSM-105 |
50.2-81.5 |
Oxide |
Column8 |
|
0.013 |
85.2 |
0.64 |
1.76 |
NSM-111 |
161-196.7 |
|
|
|
|
|
|
|
NSM-111 |
384.8-416 |
|
|
|
|
|
|
|
NSM-106 |
73-100.6 |
Oxide |
Column 9 |
|
0.012 |
98 |
0.8 |
1.85 |
NSM-112 |
194.5-217.7 |
|
|
|
|
|
|
|
Average |
0.112 |
82.49 |
0.99 |
1.23 |
Cyanide and Lime consumptions were 0.99 lb/st
and 1.23 lb/st, respectively.
Table 7. Summary of Newmont’s Silica Ridge
preliminary Bottle Roll Leach Test sourced from Newmont’s
historical files.
Further test work conducted by Newmont at Silica
Ridge suggests gravity concentration provides an improvement to the
extracted gold from 80.4% without gravity concentration to 85.5%
with gravity concentration.
Newmont’s Historical Test
Results
Silica Ridge
- initial bottle
roll results
Comp |
1.5inch Crush/Leach |
80% 200# Grind/Leach |
80% 200# Grind/Grav/ Leach |
1 |
43.22 |
93.54 |
95.14 |
2 |
14.47 |
95.33 |
96.7 |
3 |
12.77 |
90.18 |
97.65 |
4 |
13.91 |
77.81 |
92.87 |
5 |
3.72 |
97.85 |
99.67 |
6 |
78.12 |
94.5 |
96.34 |
7 |
51.09 |
78.51 |
91.24 |
8 |
62.87 |
88.5 |
91.93 |
9 |
71.3 |
27.37 |
62.51 |
10 |
72.22 |
94.8 |
95.11 |
11 |
45.67 |
93.32 |
95.58 |
12 |
60.1 |
69.24 |
83.5 |
13 |
77.72 |
80.55 |
89.76 |
14 |
56.03 |
97.15 |
98.4 |
15 |
60.55 |
79.27 |
93.9 |
16 |
54.83 |
68.49 |
79.54 |
17 |
66.24 |
74.69 |
79.68 |
18 |
55.69 |
70.2 |
48.95 |
19 |
70.59 |
79.12 |
88.93 |
20 |
83.72 |
89.98 |
85.18 |
21 |
40.95 |
52.46 |
69.06 |
22 |
74.5 |
69.96 |
61.98 |
23 |
80.47 |
92.42 |
92.68 |
24 |
58.72 |
74.03 |
54.99 |
Average |
54.56 |
80.39 |
85.05 |
Table 8. Summary of Newmont’s Silica Ridge preliminary Bottle
Roll Leach Test including grinding, gravity and leach test work
sourced from Newmont’s historical files.
North Hill, Silica Ridge and Southeast Pediment –
Kennecott’s Historical Test Results
Kennecott contracted McClelland Laboratories
Inc. to conduct agitated Leach Bottle Roll Test work on four drill
sample composites of reverse circulation drill-hole samples from
Silica Ridge and North Hill. The results yielded 80% and 82.5%
extracted gold from two drill holes SM-1 and SM-2 at North Hill.
For Silica Ridge the results yielded 80.9% and 54.9% extracted
gold. For Southeast Pediment the results yielded 84.3% and 82.8%
extracted gold. The results were conducted in 1987 for North Hill
and Silica Ridge and materials comprised 2kg split composites of
-1/4 inch (0.635cm) size which were bottled rolled for 96 hours.
The results for Southeast pediment were conducted in 1989 and
sourced from two drill holes SM-134 and SM-135 comprising 3kg split
samples.
Kennecott’s historical results are summarised in the table
below.
Kennecott’s Historical Test
Results
North Hill, Silica Ridge and Southeast
Pediment
Test Date |
Deposit |
Composite |
Head Assay* |
Calculated Head Assay |
Extraction (%) |
Hole ID |
Interval |
oz Au/ton |
oz Ag/ton |
oz Au/ton |
oz Ag/ton |
Au |
Ag |
1987 |
North Hill |
SM-1 |
|
0.034 |
0.21 |
0.035 |
0.07 |
80.0 |
28.6 |
SM-2 |
|
0.072 |
0.41 |
0.08 |
0.1 |
82.5 |
40.0 |
Silica Ridge |
SN012 |
|
0.166 |
0.81 |
0.178 |
0.94 |
80.9 |
26.6 |
SM-15 |
|
0.085 |
1.3 |
0.082 |
1.11 |
54.9 |
5.4 |
1989 |
Southeast Pediment |
SM-134 |
75-135ft |
0.071 |
0.57 |
0.07 |
0.52 |
84.3 |
15.4 |
SM-135 |
120-135ft |
5.128 |
2.9 |
3.477 |
2.24 |
82.8 |
61.2 |
|
|
|
|
* Conventional
fire assay fusion: assayed in triplicate (McClelland 1987;
1989) |
|
|
|
Table 9. Bottle Roll Agitated Leach Test work by
McClelland laboratory for Kennecott in 1987 and 1989.
KCA completed bottle roll, column leach and
gravity test work on surface and trench samples from Southeast
Pediment and Silica Ridge in 1996 and 1997. Summaries of these
results are provided below.
Southeast Pediment Test results
Date |
Test |
Composite |
Depth ft |
Type |
Head Assay (oz Au/ton) |
Size |
Time (days) |
Au Extraction% |
Average |
Calculated |
1996 |
Bottle Roll |
SEP-96-7 |
95-105 |
RC chips |
0.059 |
0.090 |
100# |
3 |
98.9 |
Bottle Roll |
SEP-96-7 |
95-105 |
RC chips |
0.059 |
0.074 |
As rec'd |
6 |
85.1 |
Bottle Roll |
SEP-96-10 |
50-60 |
RC chips |
5.192 |
5.098 |
100# |
3 |
99.7 |
SEP-96-42 |
90-100 |
Bottle Roll |
SEP-96-10 |
50-60 |
RC chips |
5.192 |
8.349 |
As rec'd |
6 |
27.4 |
SEP-96-42 |
90-100 |
Bottle Roll |
SEP-96-21 |
80-85 |
RC chips |
0.728 |
0.700 |
100# |
3 |
99.6 |
SEP-96-40 |
55-60 |
Bottle Roll |
SEP-96-21 |
80-85 |
RC chips |
0.728 |
0.688 |
As rec'd |
6 |
78.6 |
SEP-96-40 |
55-60 |
Bottle Roll |
SEP-96-23 |
80-85 |
RC chips |
0.025 |
0.023 |
100# |
3 |
91.3 |
Bottle Roll |
SEP-96-23 |
80-85 |
RC chips |
0.025 |
0.021 |
As rec'd |
6 |
95.2 |
Bottle Roll |
SEP-96-42 |
135-155 |
RC chips |
0.04 |
0.028 |
100# |
3 |
96.4 |
Bottle Roll |
SEP-96-42 |
135-155 |
RC chips |
0.04 |
0.033 |
As rec'd |
6 |
84.8 |
Bottle Roll |
SEP-96-55 |
190-195 |
RC chips |
0.022 |
0.027 |
100# |
3 |
96.3 |
Bottle Roll |
SEP-96-55 |
190-195 |
RC chips |
0.022 |
0.024 |
As rec'd |
6 |
91.7 |
1997 |
Bottle Roll |
SEP T-4 |
20-25 |
Trench |
0.017 |
0.02 |
100# |
2 |
85.0 |
Bottle Roll |
SEP T-4 |
75-80 |
Trench |
0.052 |
0.059 |
100# |
2 |
84.7 |
Bottle Roll |
SEP T-4 |
75-80 |
Trench |
0.052 |
0.058 |
1 inch |
8 |
72.4 |
Bottle Roll |
SEP T-5 |
34-40 |
Trench |
0.017 |
0.018 |
100# |
2 |
88.9 |
Bottle Roll |
SEP T-5 |
55-60 |
Trench |
0.029 |
0.031 |
100# |
2 |
93.5 |
Bottle Roll |
SEP T-6 |
75-80 |
Trench |
0.028 |
0.036 |
100# |
2 |
97.2 |
Bottle Roll |
SEP T-6 |
75-80 |
Trench |
0.58 |
0.606 |
1 inch |
8 |
76.2 |
Bottle Roll |
Bulk composite |
|
Trench |
0.171 |
- |
100# |
6 |
98.9 |
Column |
Bulk composite |
|
Trench |
0.171 |
0.160 |
0.25 inch |
111 |
92.5 |
Column |
Bulk composite |
|
Trench |
0.171 |
0.159 |
0.5 inch |
111 |
89.9 |
Column |
Bulk composite |
|
Trench |
0.171 |
0.164 |
1 inch |
111 |
87.8 |
Gravity Table |
SEP T-4 |
75-80 |
Trench |
0.036 |
|
28# |
|
14.2 |
Gravity Table |
SEP-96-51 |
85-90 |
RC chips |
1.642 |
|
28# |
|
37.3 |
Gravity Table |
SEP T-6 |
75-80 |
Trench |
0.559 |
|
28# |
|
38.9 |
Table 10. Southeast pediment Bottle Roll Test
work completed by KCA laboratory in 1986 and 1997. Materials were
sourced from reverse circulation drill chips and surface trench
samples.
Methodology for the above KCA analysis conducted
for the Southeast Pediment deposit is summarised below.
- 1996 Bottle Roll Leach tests on 6
composite samples of reverse circulation cuttings were tested with
500g splits of composite material pulverized to -100# and 1kg
splits at the as-received size which was 0.25 inch diameter.
- 1997 Bottle Roll Leach tests on 4
composite samples of surface trench and bulk composites for T-4 and
T-6 trenches with 500g splits pulverized to -100# and 10kg splits
crushed to -1 inch.
- 1997 Column leach tests were
conducted for 111 days on 40kg bulk composite samples with feed
size of -0.25 inch, -0.5 inch and -1 inch. Three of the trench
composites were crushed to -28# and passed through a Wifley No. 13
Table or Knelson Bowl Concentrator.
KCA testing of Silica Ridge Samples
Date |
Test |
Composite |
Type |
Head Assay (oz Au/ton) |
Size |
Time (days) |
Au Extraction % |
Average* |
Calculated |
1997 |
Bottle Roll |
T-8 Met 1&2 |
Trench |
0.058 |
0.06 |
100# |
2 |
95.0 |
Bottle Roll |
T-8 Met 1&2 |
Trench |
0.058 |
0.063 |
0.25 inch |
7 |
68.3 |
Bottle Roll |
T-8 Met 1&2 |
Trench |
0.058 |
0.072 |
1 inch |
7 |
56.9 |
1997b |
Bottle Roll |
Composite |
RC chips |
0.041 |
0.05 |
As rec'd |
8 |
70.0 |
Bottle Roll |
T-4 (310-320ft) |
Trench |
0.056 |
0.064 |
1 inch |
8 |
51.6 |
1997 |
Column |
T-8 Met 1&2 |
Trench |
0.058 |
0.072 |
0.25 inch |
85 |
86.1 |
Column |
T-8 Met 1&2 |
Trench |
0.058 |
0.065 |
0.5 inch |
85 |
78.5 |
Column |
T-8 Met 1&2 |
Trench |
0.058 |
0.074 |
1 inch |
85 |
77.0 |
* Average of two
30g gire assays by two independent commercial laboratories (KCA
1997a: 1997b) |
Table 11. Silica Ridge Bottle Roll Test work by
KCA laboratory in 1997. Materials were sourced mostly from surface
trench samples and a single sample from reverse circulation drill
chips.
Methodology for the above KCA analysis conducted for the Silica
Ridge deposit is summarised below.
- 1997 Bottle
Roll Leach tests were conducted on two trench composite and one
reverse circulation sample. The T-8 trench composite was tested at
-100#, -0.25 inch and -1 inch with sample splits of 500g, 10kg and
10kg respectively. The T-4 trench composite comprised a 10kg split
and was tested at -1inch for 96 hours. The reverse circulation
sample of 10kg split was leached for 96 hours at the as-received
size. The T-8 trench composite was tested in column leaches for
-0.25 inch, -0.5 inch and -1 inch feed sizes. A total of 1.73 to
1.79 lbs/ton cyanide was consumed, and 2.28 lbs/ton lime was added
to the three columns.
Historical Bulk Sampling from Southeast
Pediment
In 2002 eight trenches and a test pit were dug
comprising 1,067t of high-grade mineralisation which was processed
at the Newmont Twin Creeks Juniper mill. The bulk sample had a
calculated grade of 0.224 ounce per ton and 0.913 ounce per ton of
silver and recovery of the gold was reported as 95.2% and silver
79.5%.
Western States Minerals Corporation also sent a
bulk sample from Southeast Pediment to Gekko Systems for gravity
concentration testing which achieved 27.5% gold and 24% silver.
Intense cyanidation of the gravity concentrate extracted >97%
gold in the concentrate in 12 hours and >99% gold in the
concentrate in 24 hours.
Further study is required to incorporate a
gravity concentration circuit in conjunction with a cyanide
leaching over longer timeframes.
About Sandman
In December 2020, Gold Bull purchased the
Sandman Project from Newmont. Gold mineralization was first
discovered at Sandman in 1987 by Kennecott and the project has been
intermittently explored since then. There are four known pit
constrained gold resources located within the Sandman Project,
consisting of 21.8Mt @ 0.7g/t gold for 494,000 ounces of gold;
comprising of an Indicated Resource of 18,550kt @ 0.73g/t gold for
433kozs of gold plus an Inferred Resource of 3,246kt @ 0.58g/t gold
for 61kozs of gold. Several of the resources remain open in
multiple directions and the bulk of the historical drilling has
been conducted to a depth of less than 100m. Sandman is
conveniently located circa 25-30 km northwest of the mining town of
Winnemucca, Nevada.
Qualified Person
Cherie Leeden, B.Sc Applied Geology (Honours),
MAIG, a “Qualified Person” as defined by National Instrument
43-101, has read and approved all technical and scientific
information contained in this news release. Ms. Leeden is the
Company’s Chief Executive Officer. Cherie Leeden relied on resource
information contained within the Technical Report on the Sandman
Gold Project, prepared by Steven Olsen, a Qualified Person under NI
43-101, who is a Qualified Persons as defined by the National
Instrument NI 43-101. Mr. Olsen is an independent consultant and
has no affiliations with Gold Bull except that of an independent
consultant/client relationship. Mr. Olsen is a member of the
Australian Institute of Geoscientists (AIG) and is the Qualified
Person under NI 43-101, Standards of Disclosure for Mineral
Projects.
About Gold Bull Resources Corp.
Gold Bull’s mission is to grow into a US focused
mid-tier gold development Company via rapidly discovering and
acquiring additional ounces. The company’s exploration hub is based
in Nevada, USA, a top-tier mineral district that contains
significant historical production, existing mining infrastructure
and an established mining culture. Gold Bull is led by a Board and
Management team with a track record of exploration and acquisition
success.
Gold Bull’s core asset is the Sandman Project,
located in Nevada which has a 494,000 oz gold
resource as per 2021 43-101 Resource Estimate. Sandman is located
23 km south of the Sleeper Mine and boasts excellent large-scale
exploration potential.
Gold Bull is driven by its core values and
purpose which includes a commitment to safety, communication &
transparency, environmental responsibility, community, and
integrity.
Cherie LeedenPresident and CEO, Gold Bull Resources Corp.
For further information regarding Gold Bull
Resources Corp., please visit our website at www.goldbull.ca or
email admin@goldbull.ca.
Cautionary Note Regarding Forward-Looking
StatementsNeither the TSX Venture Exchange nor its
Regulation Services Provider (as that term is defined in the
policies of the TSX Venture Exchange) accepts responsibility for
the adequacy or accuracy of this release.
This news release contains certain statements
that may be deemed “forward-looking statements” with respect to the
Company within the meaning of applicable securities laws.
Forward-looking statements are statements that are not historical
facts and are generally, but not always, identified by the words
“expects”, “plans”, “anticipates”, “believes”, “intends”,
“estimates”, “projects”, “potential”, “indicates”, “opportunity”,
“possible” and similar expressions, or that events or conditions
“will”, “would”, “may”, “could” or “should” occur. Although Gold
Bull believes the expectations expressed in such forward-looking
statements are based on reasonable assumptions, such statements are
not guarantees of future performance, are subject to risks and
uncertainties, and actual results or realities may differ
materially from those in the forward-looking statements. Such
material risks and uncertainties include, but are not limited to,
the Company’s ability to raise sufficient capital to fund its
obligations under its property agreements going forward, to
maintain its mineral tenures and concessions in good standing, to
explore and develop its projects, to repay its debt and for general
working capital purposes; changes in economic conditions or
financial markets; the inherent hazards associates with mineral
exploration and mining operations, future prices of copper and
other metals, changes in general economic conditions, accuracy of
mineral resource and reserve estimates, the potential for new
discoveries, the ability of the Company to obtain the necessary
permits and consents required to explore, drill and develop the
projects and if obtained, to obtain such permits and consents in a
timely fashion relative to the Company’s plans and business
objectives for the projects; the general ability of the Company to
monetize its mineral resources; and changes in environmental and
other laws or regulations that could have an impact on the
Company’s operations, compliance with environmental laws and
regulations, dependence on key management personnel and general
competition in the mining industry. Forward-looking statements are
based on the reasonable beliefs, estimates and opinions of the
Company’s management on the date the statements are made. Except as
required by law, the Company undertakes no obligation to update
these forward-looking statements in the event that management’s
beliefs, estimates or opinions, or other factors, should
change.
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