SI
SI
discoversearch

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor.  We ask that you disable ad blocking while on Silicon Investor in the best interests of our community.  If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.
Strategies & Market Trends : Dino's Bar & Grill -- Ignore unavailable to you. Want to Upgrade?


To: Goose94 who wrote (12095)5/4/2015 9:51:34 AM
From: Andrew~Read Replies (2) | Respond to of 202365
 
KAM-V Kaminak Reports Over 90% Gold Recovery From 23 of 26 Column Leach Tests on Coffee Oxide Material at Various Crush Sizes

VANCOUVER, BRITISH COLUMBIA--(Marketwired - May 4, 2015) - Kaminak Gold Corporation (TSX VENTURE:KAM) today announced results of the comprehensive metallurgical test work program at the Coffee Gold Project, Yukon, that will provide process input data for the Feasibility Study scheduled for completion in early 2016. The primary objectives of the metallurgical program were to confirm the previous excellent metallurgical test results, expand the testing to all currently known potential mine areas identified, and determine optimal gold recoveries and crush sizes for the Feasibility Study.

Highlights from this work include:

• Column leach gold recoveries for bulk surface trench oxide samples for the Latte Deposit 6" crushed material averaged 88.5% (2 tests) and for the Supremo Deposit 6" crushed material averaged 87% (2 tests).

• Column leach gold recoveries for bulk surface trench oxide samples for Latte 2" and Latte 1/2" crushed material averaged 93.5% (4 tests), and for Supremo 2" and Supremo 1/2" crushed material averaged 94.5% (4 tests), with very little difference between the 2" and 1/2' crush sizes.

• Column leach gold recoveries for oxide core composites for Latte 2" and Latte 1/2" crushed material averaged 94.2% (4 tests), and for Supremo 2" and Supremo 1/2" crushed material averaged 94.0% (4 tests), again with very little difference between the 2" and 1/2' crush sizes.

• Column leach gold recoveries for oxide core composites for the Double Double Deposit 2" and Double Double 1/2" crushed material averaged 95% (2 tests), and for the Kona Deposit 2" and Kona 1/2" crushed material averaged 89.5% (2 tests).

• Agglomeration was not required for any of the column tests and low reagent consumption was reported.

• All of the column leach tests at the 0.5 inch size were performed at a temperature of 4 degrees Centigrade to simulate cold climate leaching. Column leach test work was conducted by Kappes, Cassiday and Associates, industry leading experts in heap leach processing.

• Supporting images associated with this metallurgical test work program may be viewed by clicking here.

Fred Lightner, Kaminak Director of Mine Development, stated: "This latest round of metallurgical test work strongly confirms previous testing. The volume of test work now completed on oxide has consistently produced high gold recoveries demonstrating the remarkable amenability of the Coffee deposits to the heap leach process. Crush size and recoveries from all facies, including oxide, upper and mid transitional materials, will be further evaluated in conjunction with the results of the 2015 infill drilling and the updated block models. This analysis will then determine the final decision around crush size to be incorporated into the feasibility study due out in early 2016."

2014-2015 Coffee Gold Project Metallurgical Test Work Program

Results of the column leach tests conducted by Kappes, Cassiday and Associates ("KCA") are detailed below in Table 1 and 2. It should be noted that 3 different crush sizes were tested on the bulk samples: 6" refers to a sample 100% passing 175 mm or approximately 80% passing 150 mm, 2" refers to a sample 100% passing 62.5 mm or approximately 80% passing 50 mm and 0.5 inch refers to a sample 100% passing 16 mm or approximately 80% passing 12.5 mm.

All column leach test work reported no percolation problems; therefore, the use of cement agglomeration was not required. All of the column leach tests at the 16 mm sizes (0.5 inch) were performed at a temperature of 4 degrees Centigrade to simulate cold climate leaching. The 175mm (6 inch) and 62.5mm (2 inch) crush columns were too large to be contained in the refrigerator and were leached at ambient lab temperature. Previous work has shown only a minor (-1%) gold recovery difference between ambient and cold climate leaching.

Table 1 Column Leach Test Results - Bulk Surface Oxide Samples

Column Sample

Description

and Location
Ambient Temp

°C*
Crush Size,

inches
Calculated

Head Grade

g/t Au
Extracted

Grade

g/t Au
Gold Recovery

%
Days of

Leach
Consumption

NaCN

kg/t
Addition

Hydrated Lime

kg/t
Latte - 583150mE Trench22.061.2411.14392%680.400.99
Latte - 583150mE Trench22.021.3641.25392%460.501.01
Latte - 583150mE Trench4.00.51.1961.11093%460.541.00
Latte - 583350mE Trench22.061.1440.97185%680.410.99
Latte - 583350mE Trench22.020.8900.82993%460.551.01
Latte - 583350mE Trench4.00.50.9700.92996%460.550.98
Latte Mine Block**4.00.59.5419.06995%670.580.99
Supremo Mine Block**4.00.55.5515.45798%670.680.99
Supremo T2-T4 Composite22.062.0981.93592%670.531.49
Supremo T2-T4 Composite22.022.0531.91493%670.961.51
Supremo T2-T4 Composite4.00.51.9021.84497%670.591.49
Supremo T3 Composite22.062.8552.35382%***670.461.51
Supremo T3 Composite22.022.2802.12093%670.721.59
Supremo T3 Composite4.00.52.2562.15395%670.291.51
* The 2 inch and 6 inch crush columns were too large to be contained in the refrigerator and were leached at ambient lab temperature (22°C).

** The Latte and Supremo mine block samples were bulk samples taken at a continuous section of selected higher grade trench locations without any dilution intervals. Latte Mine Block was taken from the 583150mE Trench and Supremo Mine Block was taken from the 6974000mN Trench (T4).

*** The assay screen analysis of the tailings from this test indicated that 53 % of the gold lost to the tailings was contained in plus 100mm (4 inch) size fractions due to an assay of those fractions that was abnormally high. The plus 4 inch tailings assayed 1.48 g/t Au while the plus 4 inch head assay for the same sample was only 0.21 g/t Au. Due to the coarse particle size assaying accuracy is compromised.

Table 2 Column Leach Test Results - Drill Core Composites Oxide Samples

Column Sample

Description and Location
Ambient

Temp

°C
Crush Size,

inches
Calculated

Head Grade

g/t Au
Extracted

Grade

g/t Au
Gold Recovery

%
Days of

Leach
Consumption

NaCN

kg/t
Addition

Hydrated

Lime

kg/t
Latte Oxide West22.021.1721.11395%450.481.52
Latte Oxide West4.00.51.2221.06495%450.171.53
Latte Oxide East22.021.0340.96193%810.871.53
Latte Oxide East4.00.50.9620.90694%810.301.52
Supremo Oxide West22.021.3061.17190%670.491.51
Supremo Oxide West4.00.51.2761.21595%670.841.50
Supremo Oxide East22.021.6681.59095%670.741.53
Supremo Oxide East4.00.51.7821.70796%670.321.49
Kona Oxide22.021.4151.24588%810.821.56
Kona Oxide4.00.51.3601.24291%810.372.06
Double Double Oxide22.024.3304.09995%810.871.56
Double Double Oxide4.00.52.9882.84995%810.322.02
Leach Kinetics of Latte and Supremo Samples

As experienced in earlier test work, the leaching kinetics of all samples was very rapid. Although the finer crush sizes do illustrate somewhat faster leaching, even the 6 inch crush samples leach extremely quickly. For illustration purposes, please view the supporting images associated with this metallurgical test work program by clicking here.

Comparative Bottle Roll Test Work

Results from bottle roll test work undertaken on splits of the same composites utilized for column leaching are detailed below in Table 3. By using a fine grind, recoveries were not substantially increased over the column leach tests, indicating that heap leaching will most probably be economically more attractive than agitation leaching (given the lower capital and operating costs typically associated with heap leaching).

Table 3 Results of Bottle Roll Leach Tests

DescriptionCalculated

Head Grade

g/t Au
Extracted

Grade

g/t Au
Avg.

Tails

g/t Au
Gold

Recovery

%
Consumption

NaCN,

kg/t
Addition

Ca(OH)
2,

kg/t
Latte - 583150mE Trench1.0630.9300.13387%0.022.25
Latte - 583150mE Trench1.0781.0180.06094%0.183.00
Latte - 583350mE Trench0.9190.8560.06393%<0.012.25
Latte - 583350mE Trench0.8680.8300.03896%0.083.00
Latte Mine Block8.8848.3570.52794%0.083.50
Latte Oxide West1.1251.0670.05895%0.082.50
Latte Oxide East0.9800.9270.05395%0.062.50
Supremo Mine Block5.0204.9120.10898%0.032.75
Supremo T2-T4 Composite1.6641.6200.04597%<0.013.00
Supremo T3 Composite2.3992.3220.07797%0.132.00
Supremo Oxide West1.2421.1890.05396%0.022.00
Supremo Oxide East1.7771.7170.0697%0.101.75
Kona Oxide1.2341.1130.12190%0.312.50
Double Double Oxide2.6352.5270.10896%0.152.50
Core Sample Selection for the 2014 - 2015 Metallurgical Test Program

All of the samples used for the core sample portion of column leach tests were composited from drill core consisting of a wide distribution of different drill holes and individual intervals to give a representative sample of each deposit area. Details of the metallurgical test work composite selection are provided in Table 4.

Table 4 Metallurgical Core Composite Selection

Sample DescriptionNo. of Core Drill HolesNo. of Individual Drill Intervals
Latte Oxide West567
Latte Oxide East856
Supremo Oxide West1373
Supremo Oxide East1297
Kona Oxide1152
Double Double Oxide767
QA / QC

Kaminak's disclosure of metallurgical data in this press release has been reviewed and approved by Fred Lightner, P.E., Director or Mine Development to Kaminak Gold Corporation, who serves as a Qualified Person under the definition of National Instrument 43-101. Disclosure of additional technical or scientific information in this press release has been reviewed and approved by Tim Smith, P.Geo., Vice President Exploration of Kaminak Gold Corporation, who serves as a Qualified Person under the definition of National Instrument 43-101.

On behalf of the Board of Directors of Kaminak

Eira Thomas, President and CEO, Kaminak Gold Corporation

For further information about Kaminak Gold Corporation or this news release, please visit our website at www.kamin ak.com.

stockboard.com