REP21328

• Permit No: C1982055
• IBM Index Class Name: Report
• Doc Name: Review of 1986-1987 Hydrologic MONITORING Data
• From: MLRD
• To: ENERGY FUELS MINING CO
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

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STATE OF COLORADO
'~~~` Roy Romer, Governor
~l876 ~
DEPARTMENT OF NATURAL RESOURCES ~
MINED LAND RECLAMATION DIVISION1(L~1_
FRED R. BANTA, Dlroctor -`~
December 2, 1987 ~
~ ~~' ~° ~
Mr. David R. Gossett, Chief Mining Engineer
Energy Fuels Mining Company ~~~'~/~ ~ `~`
One Tabor Center, Suite 2500 ~^
1200 Seventeenth Street
Denver, Colorado 80202
l5
Re: Animas Mine (Permit No. C-82-055) Hydrology and Self-Inspection Reports
for 1986-1987 Monitoring Year
Dear Mr. Gossett:
We have received and have reviewed the following data for the Animas Mine for
the above referenced monitoring year which consists of the third and fourth
quarters of 1986, the first and second quarters of 1987:
1) Daily precipitation and temperature records.
2) Quantity and quality (field parameters) data for discharges from
the sediment pond and flows in the permanent diversion.
3) Quarterly analytical data for certain of these discharges and flows.
4) Quarterly sediment pond inspections.
5) Quarterly refuse pile inspections.
There were no analyses of precipitation related flows and discharge for the
third quarter 1986, as acknowledged by the operator's representative in the
letter accompanying the data for that quarter. Portions of the precipitation
record for that quarter were also missing. Data for the remaining three
quarters of the 1986-87 monitoring year were essentially complete.
Surface Water
Analyses of water sampled from flows in the permanent diversion and from
discharges from the sediment pond closely resemble those from previous years.
Characteristically, the sediment pond discharges water significantly more
saline than that carried by the diversion. Water in the sediment pond is a
combination of both rv noff from the disturbed area of the mine and mine
pumpage. Some of the samples analyzed contained values of dissolved iron,
manganese and aluminum that exceed, drinking water and agricultural
standards. Such exceedances, however, have occurred in these waters in
previous years. Since these levels are present in water being carried by the
diversion ditch, as well as in that discharged from the sediment pond, they
appear to be naturally generated and not necessarily related to the presence
of the mine.
423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. [phone]