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2017-04-13_REVISION - M1980244
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2017-04-13_REVISION - M1980244
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Last modified
5/4/2017 12:07:31 PM
Creation date
4/24/2017 9:10:16 AM
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Template:
DRMS Permit Index
Permit No
M1980244
IBM Index Class Name
Revision
Doc Date
4/13/2017
Doc Name
Request for Technical Revision
From
CC&V
To
DRMS
Type & Sequence
TR90
Email Name
TC1
WHE
Media Type
D
Archive
No
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Modification AGADR <br />In order to construct the retort minor changes are required to the existing refinery facility and AGADR <br />infrastructure. An additional foundation will be poured on top of the current refinery floor to support the <br />retort; this foundation will be roughly 5 inches thick (drawing 40-645-01 within Attachment 2). <br />Foundations will also have to be poured to support the chiller and the ventilation stack please (see <br />attached drawing 40-645-01 within Attachment 2). The foundations for the retort and the stack will be <br />poured on top of existing concrete, roughened to ensure the new foundations adhere to the existing <br />concrete. Electrical wiring will be run to the retort and the chiller, however infrastructure is already in <br />place to support the additional electrical demand. <br />Anticipated Mercury Recovery <br />In 2016, CC&V undertook a trial transporting 5,134 lbs of gold concentrate to be processed through a <br />mercury retort at one of Newmont's Nevada operations. The 5,134 lbs of gold concentrate yielded 39 lbs <br />of mercury. In this trial a ton of CC&V gold concentrate generated approximately 15.2 lbs of mercury. <br />In addition to the trial run in Nevada, CC&V also conducted analytical tests on the gold concentrate <br />generated at both ADR facilities. Table 1 below contains the analytical results of gold concentrate testing. <br />On average, gold concentrate from AGADR contains 6.32 Hg lbs/ton of concentrate with a maximum <br />measured concentrate being roughly 15.4 Hg lbs/ton of concentrate. Concentrate from SGADR contains <br />significantly less mercury with an average mercury content of .06 Hg lbs/ ton of concentrate and a <br />maximum content of 0.1 Hg lbs/ton of concentrate. <br />Tablel: Results of analytical testing of CC&V gold concentrate. <br />9/12/2016 7,682 <br />9/15/2016 27.63 <br />10/18/2016 2,210 <br />10/24/2016 3,740 <br />10/31/2016 25 <br />11/3/2016 2,885 <br />11/17/2016 25 <br />11/29/2016 24.7 <br />12/30/2016 933 <br />2/14/2017 1,500 <br />2/27/2017 50 <br />AVERAGE (Hg mg/kg): 3,158 30 <br />MAXIMUM (Hg mg/kg): 7,682 50 <br />AVERAGE (Hg lbs/ ton): 6.32 0.06 <br />MAXIMUM (Hg lbs/ ton): 15.36 0.1 <br />Based on historical data and the current life of mine business plan, CC&V anticipates producing roughly <br />20 to 22 tons of gold concentrate each year, until forecast closure (2025). Assuming a maximum <br />accumulation scenario (15 Hg lbs/ton of gold concentrate), CC&V anticipates annual mercury collection <br />will range from 300 lbs to 330 lbs. Recovered mercury will be highly dependent on ore geochemistry, <br />CC&V anticipates that annual recovery rated will actually be well below 5 Hg lbs/ton gold concentrate; <br />however have elected to permit using the most conservative approach.
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