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2017-06-26_HYDROLOGY - M1980244
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2017-06-26_HYDROLOGY - M1980244
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Entry Properties
Last modified
12/27/2020 1:25:58 AM
Creation date
6/28/2017 10:03:40 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1980244
IBM Index Class Name
Hydrology
Doc Date
6/26/2017
Doc Name
Demonstration of Compliance with WQCC Regulation No 41
From
Newmont
To
DRMS
Email Name
TC1
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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Table 7: Groundwater and French drain water chemistry for Arequa Gulch near the Carlton Mill <br /> tailings and heap leach facilities (after EPA, 1992, Table 4-4). Geometric mean data for CC&V <br /> compliance monitoring wells in Arequa Gulch are also provided for comparison. Data are in mg/L <br /> except for pH, which is in standard units. Note that the data in the first four columns are for total <br /> species, whereas the data in the final two columns are for dissolved species (except for sulfate and <br /> TDS, which are total). <br /> Arequa Arequa Geomean Range <br /> French Gulch Gulch Well CC&V From <br /> Analyte Drain Upstream Downstream PZ-6 Wells CC&V <br /> Field pH 6.6—7.89 4.32 - 5.1 7.69 - 8.1 8.8 6.49 5.25—7.09 <br /> TDS 850 -860 1100 1400 6200 1389 700 -2890 <br /> SO4 350 -440 450 -970 400 -3500 2700 755 200— 1260 <br /> Zn 0.028 -0.38 1.8 -2.7 0.009 - 1.1 10 0.07 0.01 —0.31 <br /> The data in Table 7 indicate that sulfate in Arequa Gulch groundwater has been above the domestic well <br /> standard of 250 mg/L for at least 30 years, and the CC&V compliance monitoring data are within the <br /> range of the older data. The geometric mean pH data from the CC&V compliance monitoring wells are <br /> within the range of the older upstream and downstream data, and zinc is within the range of the older <br /> downstream data. <br /> CRMW 3A-35 and CRMW 36-63 are constructed in an area underlain by Precambrian rock (the <br /> Precambrian-diatreme contact is slightly north of the old Carlton mill site). It is likely that due to the low <br /> permeability of the Precambrian rocks, groundwater does not infiltrate much below the alluvium- <br /> Precambrian contact. Thus, the chemical load resulting from historic mining and milling is contained <br /> within a relatively shallow aquifer. <br /> The construction of the synthetically-lined VLF1 effectively eliminates recharge from the north and east <br /> forks of Arequa Gulch. As a result, recharge to the shallow Arequa Gulch aquifer can only come from the <br /> slopes north and south of the monitoring wells. Therefore, flushing of the soluble constituents from the <br /> shallow groundwater in Arequa Gulch is likely to be very slow. VLF1 is not a new or increased source of <br /> soluble constituents. <br /> The data presented indicate that groundwater currently being sampled by CC&V has been impacted by <br /> historic mining activity that occurred before January 31, 1994. <br /> 6.3 Vindicator Valley <br /> The Vindicator Valley compliance monitoring wells are constructed within the diatreme. Figure 30 shows <br /> the Vindicator Valley area from Plate 1 of Lindgren and Ransome (1906). Vindicator Valley contained a <br /> number of mines including the Vindicator, Lillie, Last Dollar, Hull City and Golden Cycle mines, which <br /> were located up-gradient of the current groundwater monitoring wells. These mines had significant waste <br /> rock dumps that spread down the hillside below the shafts, and the ore varied from oxidized to slightly <br /> sulfidic (Lindgren and Ransome, 1906). The dumps were removed for processing some time ago, and <br /> the slopes graded and revegetated. In addition, the valley contained multiple rail lines and the town of <br /> Independence. <br />
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