TDG GOLD Corp. Provides Initial Metallurgical Testing Results Including Recover Y up to 94.8% GOLD and 77.2% Silver, Shasta Project, Toodoggone District, B.c.
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TDG Gold Corp.
Unit 1 - 15782 Marine Drive
White Rock, B.C. V4B 1E6
www.tdggold.com
TDG GOLD CORP. PROVIDES INITIAL METALLURGICAL TESTING RESULTS INCLUDING RECOVER Y UP TO
94.8% GOLD AND 77.2% SILVER, SHASTA PROJECT, TOODOGGONE DISTRICT, B.C.
White Rock, British Columbia, May 02, 2022 - TDG Gold Corp - (TSXV: TDG) (the “Company” or “TDG”)
is pleased to announce preliminary metallurgical results from two composite samples constructed from
diamond drillholes SH21-004 and SH21-005 from the 2021 drilling program at its former producing gold-
silver Shasta mine, Toodoggone District, B.C.
The samples tested responded very well to gold (“Au”) and silver (“Ag”) recoveries by conventional
flotation, direct cyanidation and a combination of flotation and cyanidation treatments, which is similar
to the historical processing flowsheet used at the Baker mill. Some of the gold occurs as coarse nugget
grains which are amenable to gravity concentration.
Direct cyanidation achieved extraction percentages of 84.7% to 96.4% for Au, and 69.1% to 80.5% for Ag
(see Table 1). Flotation testing delivered recoveries to concentrate of 94.3% and 98.0% for Au, and 88.4%
and 96.0% for Ag (see Table 2). Flotation concentrate regrinding and cyanidation delivered recoveries of
87.7% to 94.8% for Au, and 64.8% to 77.2% for Ag.
Fletcher Morgan, TDG’s CEO, commented: “These initial metallurgical results are absolutely in line with
the recoveries indicated in the historical mill records when ore from Shasta was last processed through the
Baker mill in 2012. The key difference is that much higher-grade material was processed historically, so it’s
positive to see good recoveries achieved using conventional processing on the medium and lower -grade
gold-silver mineralization that we drilled in 2021. This is an important step forward for TDG in revisioning
Shasta as a bulk tonnage opportunity. We expect to continue metallurgical analysis this year to assist our
drill targeting and resource definition work at Shasta.”
The samples were labelled as Sample #1 and Sample #2, respectively. Figure 1 below shows the drillhole
locations in the deposit.
Figure 1. Drillholes SH21-004 and SH21-005 Locations in the Shasta Deposit.
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TDG Gold Corp.
Unit 1 - 15782 Marine Drive
White Rock, B.C. V4B 1E6
www.tdggold.com
Previous Operation
Ore from the Shasta deposit was intermittently processed at Baker mill between 1989 -1991 and 2008-
2012 before the mill was put under care and maintenance. The Baker mill was originally designed to
process the mill feeds from the Baker mine at a mill feed rate of 100 short tons per day (st/d). The mill
consisted of two stages of crushing and one stage of ball mill grinding. The Au and Ag recovery processing
flowsheet used at the early stage of the operation was a whole- ore cyanide leaching followed by Merrill
Crowe treatment to recover Au and Ag from the leaching solution. Due to changes in mineralogical
property in the late operation, the processing flowsheet was modified by incorporating a flotation pre -
concentration circuit to recover gold and gold -bearing minerals into a flotation concentrate, which was
further treated by cyanide leaching and Merrill Crowe process to recover Au and Ag from the concentrate.
The flotation tailings bypassed the cyanide leaching circuit and was disposed, together with the leac h
residue, to the tailings storage facility (“TSF”). The mill feed rate was increased to approximately 200
tonnes per day (t/d).
2021-2022 Metallurgical Test Work
Flotation
The flotation test results indicate that the two samples responded well to the flotation procedure at a
coarse primary grind size of 80% passing approximately 200 µm. The gold recovery reporting to rougher
flotation concentrates ranged from 97.2% to 99.0% for Sample #2 and 93.3% to 97.2% for Sample #1 at
different primary grind sizes, ranging from approximately 80% passing (P80) 72 µm to 209 µm. The
average silver recoveries to the rougher flotation concentrates were 90.3% for Sample #1 and 96.4% for
Sample #2.
Direct Cyanidation
The cyanide leach test results show both Sample #1 and Sam ple #2 responded well to the direct
cyanidation. The average gold extraction rates were 87.3% for Sample #1 and 95.0% for Sample #2. On
average the silver extraction rates were 72.5% for Sample #1 and 76.9% for Sample #2. The test results
also indicate that the cyanide leaching kinetics were relatively rapid, approximately more than 70% and
50% of the Au were respectively extracted from Sample #1 and Sample #2 within a leaching retention
time of 7 hours. A total leach retention time is 48 hours. The test results are summarized in Table 1.
Table 1: Direct Cyanidation Results – Head Samples
Sample ID Particle Size Calculated Head, g/t Extraction, % Consumption, kg/t
P80, µm Au Ag Au Ag NaCN Lime
Sample 1 143 0.60 29 84.7 72.7 0.63 0.46
Sample 1 103 0.63 29 87.9 75.8 0.55 0.44
Sample 1 72 0.60 32 89.3 69.1 0.69 0.38
Sample 2 148 2.11 78 93.4 73.2 0.82 0.34
Sample 2 107 2.14 78 95.1 77.0 0.82 0.34
Sample 2 72 2.27 77 96.4 80.5 0.85 0.36
The reagent consumptions are generally at reasonable levels. The average sodium cyanide (NaCN)
consumptions were 0.62 kilograms per tonne (“kg/t”) and 0.83 kg/t respectively for Sample #1 and Sample
#2. The average hydrated lime (Ca(OH)2) consumptions were low, at 0.43 kg/t for Sample #1 and 0.35 kg/t
for Sample #2 separately.
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TDG Gold Corp.
Unit 1 - 15782 Marine Drive
White Rock, B.C. V4B 1E6
www.tdggold.com
Flotation + Cyanidation
Using the bulk flotation procedure developed from the flotation tests, gold bearing bulk concentrates
were produced from 20 -kg head samples at a primary grind size of 80% passing 200 µm. The concentrates
were then reground at three different particle sizes, ranging from 80% passing 15 µm to 49 µm and then
cyanide leached for 48 hours at a sodium cyanide concentration of 2 grams per litre (“g/L”). The test
results are shown in Table 2.
Table 2: Flotation + Flotation Concentrate Regrinding and Cyanidation
* at a primary grind size of 80% passing approximately 200 µm; based on flotation head
In general, the reground flotation concentrate responded well to the cyanidation. In the tested regrind
size range, the gold and silver extractions were not sensitive to the regrind size. On average, Au and Ag
extractions were approximately 93.6% Au and 73 .5% Ag for the Sample #1’s concentrate and 96.3% Au
and 79.2% Ag for the Sample #2’s concentrate. Overall, Au and Ag recoveries (flotation + cyanidation) are
calculated to be 88.3% Au and 65.0% Ag for Sample #1 and 94.4% Au and 76.1% Ag for Sample #2,
respectively. The test results show that reagent consumptions, including sodium cyanide, are at the
reasonable levels.
Gravity Concentration
Gravity concentration testing was conducted on each of the two samples using two -pass centrifugal
concentration followed by panning on the concentrates produced from the centrifugal concentration. The
test results indicate that the two samples may contain free nugget Au grains, especially for Sample #2.
Approximately 37.6% of the Au and 12.8% of the Ag in Sample #2 were concentrated into the pan
concentrate containing 349.7 grams per tonne (“g/t”) Au and 4,816 g/t Ag. Compared to Sample #2,
Sample #1 appears less responsi ve to the gravity concentration procedure with only 15.9% of the gold
recovered into the pan concentrate with 48.3 g/t Au and 892 g/t Ag.
Grindability
The Bond ball mill work index was measured to be 16.4 kilowatt hour per tonne (“kWh/t for Sample #2
and 17.4 kWh/t for Sample #1, which are classified as moderate hardness to ball mill grinding.
Further Test Work
In 2022, TDG plans to undertake f urther metallurgical testing of various mineral samples, especially the
samples representative to different lithological and alteration domains and spatial locations. Tetra Tech
Canada Inc. is engaged to conduct the analysis for the preliminary metallurgical test results achieved from
the samples of the Shasta deposit. The metallurgical test work was conducted by Bureau Veritas Minerals
(BVM) Metallurgical Division, an accredited facility located in British Columbia, Canada.
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TDG Gold Corp.
Unit 1 - 15782 Marine Drive
White Rock, B.C. V4B 1E6
www.tdggold.com
Qualified Person
The technical content of this news release has been reviewed and approved by Dr. Huang, Ph.D., P.Eng.,
independent metallurgical consultant, a qualified person, as defined by National Instrument 43-101.
This news release includes historical drilling information that has been reviewed by the Company’s geological team.
The Company’s review of the historical records and information reasonably substantiate the validity of the
information presented in this news release; however, the Company cannot directly verify the accuracy of the historical
dat a, including the procedures used for sample collection and analysis. Therefore, the Company encourages investors
to exercise appropriate caution when evaluating these results. Further data review is underway, in order to verify the
validity of the data for the anticipated NI 43 -101 compliant mineral resource estimate.
About TDG Gold Corp.
TDG is a major mineral claim holder in the historical Toodoggone Production Corridor of north -central
British Columbia, Canada, with over 23,000 hectares of brownfield and greenfield exploration
opportunities under direct ownership or earn -in agreement. TDG’s flagship projects are the former
producing, high grade gold-silver Shasta, Baker and Mets mines, which are all road accessible, produced
intermittently between 1981-2012, and have over 65,000 m of historical drilling. In 2021, TDG advanced
the projects through compilation of historical data, new geological mapping, geochemical and geophysical
surveys, and, for Shasta, drill testing of the known mineralization occurrence s and their extensions. TDG
currently has 96,343,142 common shares issued and outstanding.
ON BEHALF OF THE BOARD
Fletcher Morgan
Chief Executive Officer
For further information contact:
TDG Gold Corp.,
Telephone: +1.604.536.2711
Email: [email protected]
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of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.
This news release contains forward- looking statements that are based on the Company’s current expectations and estimates.
Forward-looking statements are frequently characterized by words such as “plan”, “expect”, “project”, “intend”, “believe”,
“anticipate”, “estimate”, “suggest”, “indicate” and other similar words or statements that certain events or conditions “may” or
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actual events or results to differ materially from estimated or anticipated events or results implied or expressed in such forward-
looking statements. Such factors include, among others: the actual results of current exploration activities; conclusions o f
economic eval uations; changes in project parameters as plans to continue to be refined; possible variations in ore grade or
recovery rates; accidents, labour disputes and other risks of the mining industry; delays in obtaining governmental approvals or
financing; and f luctuations in metal prices. There may be other factors that cause actions, events or results not to be as
anticipated, estimated or intended. Any forward-looking statement speaks only as of the date on which it is made and, except as
may be required by applicable securities laws, the Company disclaims any intent or obligation to update any forward- looking
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uncertainty therein.