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2021-09-08_PERMIT FILE - M2021007
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2021-09-08_PERMIT FILE - M2021007
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Last modified
12/28/2024 2:10:37 PM
Creation date
9/9/2021 8:46:11 AM
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Template:
DRMS Permit Index
Permit No
M2021007
IBM Index Class Name
PERMIT FILE
Doc Date
9/8/2021
Doc Name
Adequacy Review Response
From
EAI
To
DRMS
Email Name
PSH
JLE
Media Type
D
Archive
No
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The mill process starts at the crushing circuit that will include a jaw crusher or <br /> cone crusher that will size the feedstock to 1/2" minus. The 1/2" minus will pass onto a <br /> water trough and conveyed to the ball mill and shaker table system. The <br /> concentrate will discharge into 55-gallon drum while the fines move on to a <br /> dewatering sand screw. The mill circuit flow diagram is provided herein. <br /> The water dependent processing component will be housed in a metal <br /> building. Beginning at the ball mill, the feedstock is fluidized with approximately 100 <br /> gpm at the ball mill. The fluidized feed stream is conveyed to four shaker tables <br /> requiring on 15 gpm per table or 60 gpm total. The shaker table byproduct will be <br /> dewatered and characterized for use as a construction material. The concentrate will <br /> be conveyed into 55-gallon drums. <br /> The mill design includes a recirculating process water system. Approximately <br /> 145 gpm will be needed of which approximately 90% is recirculated. The balance of <br /> the water will be lost to the concentrate that will be contained in 55-gallon drums <br /> and byproducts. The process water system will direct the process water from the <br /> dewatering screw to a three-pond settling system. Water from the third and final <br /> settling pond will be pumped back into the system at the ball mill, the beginning of <br /> the water process. <br /> Process water will be tested twice daily that the mill operates to determine <br /> the pH using a digital pH meter. For acidic water (<pH 6.5), Quicklime (Calcium <br /> oxide) will be added in a dry form and mixed within the process water tank as <br /> needed to maintain a pH range of 6.5 to 8.5. Similarly, should the pH exceed 8.5, <br /> Sodium Bisulfate will be added in a dry form to the process water tank to bring the <br /> pH back down within this acceptable range. Both the quicklime and sodium bisulfate <br /> will be palletized and delivered in 50-lb. bags or drums, with up to 2,000 lbs. stored <br /> on site at any one time. The pallets and drums will be stored inside the mill building <br /> in secondary containment in an area 8' x 8' and a depth of 4'. <br /> Mill Site <br /> Significant disturbances to the land surface will not include pit excavations, <br /> mine benches, impoundments, or waste rock disposal areas. No process water <br /> impoundments, stockpiles or tailings impoundments are planned for on-site waste <br /> storage. <br /> The feedstock and byproduct storage pads will be 60' x 24' and 45' x 20' <br /> respectively. Material storage bin figures are provided herein. The milling building <br /> will be 40'x 60'. The settling ponds for the recirculating process water system are <br /> 22' x 26'. The interior road will be 20' wide with roadside ditches and 18" culverts as <br /> the access points onto Stanley Road. <br /> The storage bins will be constructed to prevent water and wind erosion of the <br /> feedstock and byproduct stockpiles. The storage bins will have a concrete floor with <br /> a 2% slope to the center. The bin will be three sided and constructed of concrete <br /> block. When feedstock or byproduct material remains in the storage bin overnight or <br /> when the mill is not in operation, the stockpiles will be covered with a tarp, secured <br /> to the outside of the storage structure. This will convey any precipitation directly <br /> into the stormwater control structures without coming in contact with the feedstock <br /> or byproduct material. <br /> Page 6 of 23 <br />
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