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2004-05-03_REPORT - M1977004
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2004-05-03_REPORT - M1977004
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Last modified
5/12/2020 11:17:53 AM
Creation date
11/27/2007 10:25:14 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977004
IBM Index Class Name
Report
Doc Date
5/3/2004
Doc Name
Annual Report and Fee
From
Homestake Mining Company
To
DMG
Permit Index Doc Type
Annual Fee / Report
Media Type
D
Archive
No
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• (Page 2) • <br />MINE ID # OR PROSPECTING ID # M-1977-004HR <br />INSPECTION DATE /03 INSPECTOR'S INITIALS RCO <br />OBSERVATIONS <br />This inspection was performed by the Division as part of its monitoring of Hard Rock and Metals 112 permits. The <br />operator was contacted about the inspection, and a time was arranged to meet at the site. The operator'srepresentatives <br />named on page one were present during the inspection. DMG inspectors present were Bob Oswald and Harry Posey. <br />The site reclamation is well underway, as the site is has been progressing through a series of stages of the approved phased <br />reclamation plan for years. Water quality, groundwater levels, surface drainage, geotechnical stability, and revegetation <br />(including noxious weed control) are the reclamation items being monitored and treated as needed. All areas of the <br />permitted site were inspected except the Tie Camp Creek dump and the South Pit, which were inspected last year. Those <br />areas were found to be stable at that time, though not fully reclaimed, and no further reclamation was carried out during the <br />past year. <br />The Pinnacle portal continues to discharge water from the collapsed workings, though at the decreased flow rate now <br />considered normal after the remote concrete plugging in 1994. The North Pit Lake level is near its upper limit, and can be <br />controlled by the opoerator at the lake outlet structure. Lake levels influence discharge rates from the Pinnacle portal due <br />to percolation through native bank material on the fault structure. In an attempt to reduce percolation from the lake into <br />the fault, and thereby reduce portal discharge, the operator recently removed a small volume of native material, then <br />backfilled it in compacted lifts. This was at the south end of the North Pit Lake impoundment. Monitoring discharges will <br />determine if the compaction is effective. The lake volume continues to diminish as pit wall material continues to slough <br />into the lake. <br />The radium treatment plant, removed during 2002, has been buried in the Tie Camp Creek dump. The former site of the <br />plant lies along the drainageway for flows from the North Pit Lake. The drainageway still includes an acces road to the lake <br />impoundment, but much of the remainder of the drainageway has been shaped into a series of flat shallow cells which are <br />intended to catch sediment in the effluent. The cells are slated for revegetation to increase sediment capacity. <br />The operator has continued to plant lodgepole pine seedlings, an acre or two each year. Recent plantings are largely <br />surviving with minimal extra inputs. The plants may need an application of fertilizer in the future, since the waste rock is <br />almost sterile, but the main threat to the plants is still deer and elk browsing at the site. Earlier plantings of the pines are <br />now several feet tall and bearing cones. Willow stub plantings along the drainageways are becoming established, despite <br />the pressure from deer and elk. Areas seeded with grasses and legumes are getting established across the site. <br />Noxious weed control must still remain a priority at the site. There were a few areas which exhibited Canada thistle in <br />small patches, some with evidence of being sprayed in the past, but mostly appearing to be going to seed. The patches are <br />small and scattered, but the operator must remain vigilant if the patches are to be controlled and eventually eliminated. If <br />chemical control is the primary method employed, treatments must be timely to be effective. At this time there is no <br />problem. <br />The head scarp east of the North Pit Lake was observed to be approximately the same as it was observed last year. No <br />earthwork to close the cracks or divert water away from the cracks has been done, and the cracks remain open to water <br />and continued movement. These are within the permit boundary, but there is some limitation as to reclamation options <br />available at this time. The operator continues to survey the scarp area and slopes to measure the amount of movement. <br />The sediment pond and sand plant building were inspected. The pond contained water, and the dam appeared to be in good <br />condition. Beavers have become active in the creek above the pond and immediately below the plant (near monitoring point <br />SW-33). They have not damaged structures but their activity is being monitored by the operator. The sand plant is no <br />longer being used, and is planned for demolition and removal by the operator, possibly in 2004 or 2005. <br />The set of piezometers checked by the operator have been yielding lower water level readings in 2002 and this year, <br />probably due to the drought. (It is also believed that recent dry years have resulted in less slope movement measured on <br />the east wall of the North Pit Lake.) <br />The Tie Camp Creek dump was quickly inspected while leaving the site. It still contains some topsoil and sericite for use in <br />capping additional debris or material. <br />
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