REP01616

• Permit No: C1981038
• IBM Index Class Name: Report
• Doc Date: 1/20/1990
• Doc Name: CYPRUS ORCHARD VALLEY MINE FN C-81-038 1990 MINE INFLOW REPORT
• From: CYPRUS ORCHARD VALLEY
• To: MLRD
• Permit Index Doc Type: MINE INFLOW REPORTS
• Media Type: D
• Archive: No

STATE OF COLORADO
Roy Romer, Govei
DEPARTMENT OF NATURAL RESOURCES
MINED LAND RECLAMATION DIVISION
FRED R. BANTA, Director
DATE: September 14, 1989
T0: Jeff Clayton
FROM: Cathy Begej (~
RE: Orchard Valley 1989 Mine Inflow Study, C-81-038
I have reviewed the Orchard Valley Annual Mine Inflows study. They have met
the minimum requirements of Stipulation 4, but no more. It is a very
qualitative report. I would like to see the following improvements in future
reports.
1. Flow from the Steven's Gulch water line should be measured to
document mine usage. It would be nice to know the quality of that
water in trying to assess the source of the very alkaline, saline
water.
2. An estimate of the volume of standing water in the mine coupled
with an estimate of the surface area of exposed water and the
evaporation rate. Their estimates of water consumption in the mine
are very vague and extrapolated from 1985-1986 data.
3. I think that the change in water quality justifies a request to
monitor field parameters on all areas of standing water to assess
the degree of heterogeneity within the mine.
I have the following specific questions about th 1989 Report:
1. Please clarify the meaning of the areas marked with diagonal lines
and diagonal dots and hyphens. A legend apparently did not get
finished on the central right side of the map.
2. The ]988 report noted a 0.25 gpm drip between Panels G and H (1988
Site 25). Did the seep really disappear this year?
A brief summary of the report follows. Mine inflows have decreased from 3 gpm
in 1988 to 2.5 gpm in 1989. This is higher than the 1 gpm recorded in 1987,
but is to be expected given the expansion of the extent of the workings. The
permit application projected worst case inflows of 5.2 gpm below East Rootcap
Creek and 5.7 gpm below Stevens Gulch with 33.5 gpm throughout the
life-of-mine. It collects along north and east faces of mains. The main
215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. [phone]