Laserfiche WebLink
September 18,2012 C-1994-082/Yoast Mine MLT <br /> Inspection Topic Summary <br /> NOTE: Y=Inspected N=Not Inspected R=Comments Noted <br /> V=Violation Issued NA=Not Applicable <br /> NA - Air Resource Protection N -Roads <br /> N - Availability of Records N -Reclamation Success <br /> N -Backfill & Grading R -Revegetation <br /> NA -Excess Spoil and Dev. Waste NA - Subsidence <br /> NA -Explosives R - Slides and Other Damage <br /> N -Fish& Wildlife N - Support Facilities On-site <br /> R -Hydrologic Balance N - Signs and Markers <br /> NA - Gen. Compliance With Mine Plan N - Support Facilities Not On-site <br /> N - Other N - Special Categories Of Mining <br /> NA -Processing Waste N - Topsoil <br /> COMMENTS <br /> A partial inspection of the Yoast Mine was conducted by Marcia Talvitie of the Division. The <br /> inspection took place on the afternoons of Tuesday and Thursday, September 18 and 20, 2012. <br /> The weather on both days was clear, with the exception of a smoky haze, and temperatures <br /> reached the upper 70's. The fall colors were beautiful, and ground conditions were extremely <br /> dry. <br /> HYDROLOGIC BALANCE -Rule 4.05 <br /> Drainage Control 4.05.1, 4.05.2, 4.05.3; Siltation Structures 4.05.5, 4.05.6; Discharge Structures <br /> 4.05.7, 4.05.10; Diversions 4.05.4; Effluent Limits 4.05.2; Ground Water Monitoring 4.05.13; <br /> Surface Water Monitoring 4.05.13; Drainage—Acid and Toxic Materials 4.05.8; Impoundments <br /> 4.05.6, 4.05.9; Stream Buffer Zones 4.05.18: <br /> Pond 012 Watershed <br /> • Pond 012 was discharging at the time of the inspection. The outlet structure was clear of <br /> debris, and the slopes were stabilized with good vegetative cover(Photo 1). Mr. James said <br /> that SCC would be cleaning sediment from the pond later this fall. An excavator will be <br /> used, and will muck out all of the sediment it can reach from the pond bank. The excavator <br /> is unable to reach to the center of the pond, so an island of sediment, which is already <br /> covered with vegetation, will remain. <br /> • The water level in Pond 012A was not high enough for discharge to be occurring. The water <br /> was opaque brown in color, and there appeared to be a fraction of suspended solids. The <br /> trash rack for the primary spillway was cleared of debris. The majority of the pond inslopes <br /> were well vegetated and stable; on the eastern bank, however, a number of rills were visible <br /> (Photo 2). <br /> • Pond 012A receives flow from two channels: YPM-6-2 and YPM-5-1. A delta of deposited <br /> sediment was visible at the terminus of YPM-6-2. Upstream of Pond 012A, there was <br /> evidence that this channel had experienced some erosion earlier in the season (Photo 3); the <br /> TRM channel lining was torn in places, and absent in others. <br /> Number of Partial Inspection this Fiscal Year: 4 <br /> Number of Complete Inspections this Fiscal Year: 1 Page 2 of 8 <br />