2021-07-14_REVISION - M2012032 ‎(3)‎

• Permit No: M2012032
• IBM Index Class Name: REVISION
• Doc Date: 7/14/2021
• Doc Name Note: I of II
• Doc Name: Adequacy Review Response
• From: Ouray Silver Mines
• To: DRMS
• Type & Sequence: TR15
• Email Name: LJW
• Media Type: D
• Archive: No

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&DRAY SILVER MINES
16. Please clarify the number of tanks associated with the Zn Rougher Scavenger Flotation Cells
and their capacity.
Response:2 banks of 3 cells as shown on the MID drawings. Each bank is 1320 gallons. These are pre-
existing tanks that were part of the original mill certification from 2015. Please see Figure 2.
17. It is also stated that the Zn Rougher Flotation Cells consists of two banks at 1320 gallons each,
however Table 1 lists only one tank at 1320 gallons. Please clarify the number of tanks associated
with this stage of the circuit and update Table 1.
Response: There is one Zinc Rougher Flotation Tank Cell at 1700 gallons, as shown on drawing 300-PI-
007.As with lead there are two Zinc scavenger rougher flotation cells at 1320 gallons each.
18. Several depictions of tanks and circuitry on Figure 1 are not labeled. Please update Figure 1
to include all labels.
Response: This is a simplified flow diagram designed for presentation to the general public. It is a
simplified version of the milling process for those inexperienced in the flow process. It is not intended to
replace the P&IDs. For further clarification see the MID drawing.
19. Provide a summary of the day tanks that are to be located in the mill tunnel.
a. Include the location, chemical type, volume, quantity (where applicable) and
referenced drawing(s)
b. Section 4 discusses the new reagent tanks, pump boxes and pumps to be added
to support the new Pb and Zn flotation circuits and references Table 2 for their volume
and secondary containment.Table 2 appears to be consistent with the tables submitted
for reagent storage in the Reagent Building that is currently under review as part of
TR-14. Please clarify if this section is applicable to the Reagent Building or if additional
mixing and storage tanks will be located in the mill tunnel in addition to the day tanks.
c. Section 6 - Chemical Handling Systems and Containment states that "Reagents are
stored in the reagent room located on the east side of the mill filter building except the
lime day tank of 9200 gallons." Conversely the updated Table 1 on page 24 of the
Second Adequacy Review submitted for TR-14 states that day tanks for ALL chemicals
EXCEPT lime and Floc AF-309 have 70 gallon day tanks located in the mill tunnel. Please
clarify what chemicals have a day tank associated with them, if that tank houses
concentrated chemicals or mixed solution, the locations of the day tanks and update
Table 1 of TR-15 to reflect the storage of those materials within the mill tunnel.
Response:
a. Please see the attached Table 8 which provides a summary of the day tanks located in the mill
tunnel.
b. Table 2 is consistent with tables submitted for reagent storage in the Reagent Building. No
additional mixing and storage tanks will be located in the mill tunnel in addition to the day tanks.
c. The statement regarding the lime day tank in TR-15 is not accurate. The lime storage tank off
9200 gallons is in the reagent room which is part of the mill filter building. There is no lime day
tank. The language in TR-14 is correct.
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