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INSPEC19884
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INSPEC19884
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Entry Properties
Last modified
8/24/2016 9:20:51 PM
Creation date
11/18/2007 9:32:30 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1986076
IBM Index Class Name
Inspection
Doc Date
10/20/2006
Doc Name
Inspection report
From
DRMS
To
DGMC
Inspection Date
10/5/2006
Media Type
D
Archive
No
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(Page 2) <br />MINE ID # OR PROSPECTING ID # M-1986-076 <br />INSPECTION DATE 10/5/06 INSPECTOR'S INITIALS RCO.ICAP <br />OBSERVATIONS <br />This partial inspection was performed by the Division as part of its monitoring of Hard Rock and Metals 110d permits. The <br />operator was contacted about the scheduled inspection, but was not present onsite during the inspection. The site was <br />secured and not active at the time of the inspection. The weather was rainy and foggy but conditions did not present the <br />inspection. <br />The required permit ID sign was observed posted at the entrance to the permit area. The permit area corners were marked by <br />signs mounted on steel T-posts. All activity appears to be within the boundaries. There are numerous underground openings <br />throughout the permit area, but all are caved shut, and all activity is carried out on the surface. <br />The mill building was locked and the surrounding area was orderly. The concrete stem walls form the secondary containment <br />for the milling circuit inside, and they appeared to be sound. The southern side of the building is situated above the steep cut <br />for the access road. The unconsolidated material on the cut slope has been observed to be sloughing during recent years, <br />which if allowed to continue, would undermine the building and compromise the integrity of the containment and the building. <br />The operator has tried to prevent the loss of material by hand-placing large rocks on the slope surface, and has grouted <br />portions of it. This seems to behaving the desired effect, but the sloughing is proceeding toward the west, just beyond the limit <br />of the operator's past armoring. The cut slope is taller to the west, and stabilizing the slope may require different methods. It is <br />suggested that the operator investigate a combination of driven or "planted" anchors, timber cribbing, larger angular boulders, <br />or other type of revetment, in addressing this issue, before it becomes a problem. The operator is reminded that the mill <br />building is one of the DMO's environmental protection facilities (EPFs) and its continued integrity is critical. The operator is <br />welcome to contact this inspector to discuss stabilization options. <br />Behind the building there is a water tank for milling needs, filled from pumping water from the lower portal. The diesel tank is <br />also behind the mill, placed in a steel secondary containment tank, all of it covered to prevent it filling with preciptitation. The <br />ore hopper and conveyor are installed here also, the hopper being covered to reduce weathering of the residual ore. These <br />practices are proper and necessary, and the operator is urged to continue them. <br />The tailings sump outside the east end of the building was fairly empty, apparently having been recently cleaned out. It is <br />unlined and intended to allow dewttering of the neutralized tailings before their placement in the tailings pond. The approved <br />plan requires that the tailings be completely neutralized before being introduced to the sump, and the operator must ensure that <br />this is the only way the milling proceeds. <br />The mining area east of the mill is proceeding up the hill slope in a narrow band, in accordance with the approved plan. The <br />hillside being mined is steep. The operator is required to salvage topsoil for reclamation, and has several stockpiles of topsoil <br />onsite. However, the native topsoil above the cut slope for the mining face does not appear to be stripped and is eroding down <br />into the area of active mining, where some mixing of soil and rock was observed. It is probable that the steep gradient of the <br />hill slope may prevent access to some areas by equipment to strip the topsoil prior to mining. Abetter effort to segregate the <br />soil for later use in reclamation (for example, by either stripping it prior to initiating the mining cuts, or carefully removing fallen <br />soil from the mining floor before it is degraded by mixing). The soil erosion and degradation is noted as a problem in this <br />report and will require the operator to submit an explanation of how he plans to correct the problem See the last page for the <br />correction date. <br />Mining equipment and other items noted on the various bench levels of the site include a small dozer, backhoe loader, <br />compressor, ore crusher, small cement mixer and extra milling equipment. The wooden shed on the mill level was intact and <br />secured. There are several topsoil stockpiles. <br />The tailings pond, also unlined, contained only a fraction of the voloume of tails it is designed to hold. There was an estimated <br />volume of less than 50 yards of tailings sand in it. The cut slope above it, and the fill slope providing containment appeared <br />stable. The access ramp is maintained. <br />The road to the lower portal contains more soil than rock, and is the road most vulnerable to erosion on the site. It did not <br />exhibit erosion damage this year, and the sediment containment pond at the bottom of the road was not filled. Afair amount of <br />desirable natural vegetation was observed on the road, which probably helps reduce erosion. This road segment is also site to <br />former Canada thistle patches, but the operator's diligence in control has paid off -there was no weed problem observed. <br />Continued monitoring is needed, with treatments as necessary, here and throughout the site. The weed control efforts are <br />commendable. <br />
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