2015-02-09_INSPECTION - C1981014

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February 6, 2015 C- 1981 - 014 /Southfield Mine RDZ February 7th) make sure that a marker was added before. Note the status of hole — open or sealed, reclaimed or not. For the holes under the RDA, the process included navigating to the location (based on Map 12) and placing a marker. There was no check for evidence of a hole or drilling because the RDA would have covered any evidence. On February 6th, 12 holes were surveyed (no open holes were found) and markers were added at six holes under the RDA. On February 7th, eight holes were inspected, and no open holes were found. A summary of the results is shown in the attachment to this report. At most of the sites where no hole or casing was seen, there was little evidence of drilling (such as cuttings or old trash), sealing (concrete or bentonite), or disturbance. At some of the sites, reclamation grasses (e.g., side oats grama) were seen in the vicinity of the documented location. At each of the sites, there appeared to be access for a drill rig from a road or track and enough open space for a drilling operation (although small trees or shrubs have grown in recent years at some sites). No significant reclamation problems were seen such as poor grading, erosion, large bare areas, or weeds at all site, however at SF -85 -05 there was a small indentation (approximately two feet deep and five feet by twelve feet on the surface). It is not a serious problem but warrants discussion. The primary GPS system used in the survey was the one owned by Dr. Corley. He uses a base station on his ranch in conjunction with a Leica GS15 receiver with antenna. Dr. Corley has extensive experience using GPS equipment for surveying on his property and some experience at other locations. In addition, Mr. Weaver carried a small hand help unit for navigation. Rob Zuber used his Trimble GPS Yuma unit to check the latitude and longitude of the locations that Mr. Weaver had on his list of holes. At all of the sites, the Yuma coordinates at the documented locations of the holes matched Mr. Weaver's coordinates within 1 /10000 of a degree (approximately 36 feet), and sometimes were within 1 /100000 of a degree. The one site where the Yuma did not confirm the location on January 27, 2015 was SR -36, under the RDA (as reported in the January 2015 inspection report by DRMS). However, during a return visit on February 6th to place a marker, the Yuma coordinates matched Mr. Weaver's list within 1 /10000 of a degree. SUBSIDENCE — Rule 4.20: A small hole was inspected near the southeastern corner of the old Vento Mine surface outline. This had been observed by Al Weaver and Dr. Corley on January 30, 2015. Dr. Corley provided the coordinates: Latitude - N 38 deg, 16' 31.544" Longitude — W 105 deg, 09' 24.444 ". This hole was found at these coordinates, and it could have been caused by subsidence. It is approximately one - foot by two -feet on the surface and is approximately 20 inches deep. It would be prudent to seal it for safety reasons, but it is not highly dangerous, and it is not clear at this time that the hole was caused by Southfield mining operations. (It is clear that Southfield mined in this area, per the closure maps.) Number of Partial Inspection this Fiscal Year: 6 Number of Complete Inspections this Fiscal Year: 2 Page 3 of 8