GENERAL51479

• Permit No: C1981012
• IBM Index Class Name: General Documents
• Doc Date: 12/14/1983
• Doc Name: PROPOSED DECISION AND FINDINGS OF COMPLIANCE
• From: The Allen Mine
• Permit Index Doc Type: FINDINGS
• Media Type: D
• Archive: No

-23-
The application indicates that Apache Canyon and Ciruela Canyon contain
unconsolidated streamlaid deposits. Some of these deposits have been and will
be undermined by the proposed underground operations. However, no information
has been provided concerning the presence or absence of alluvial ground water
or alluvial water quality in these deposits. This information is necessary
for the alluvial valley floor determination, the identification of renewable
resource lands, and to fully project the probable hydrologic consequences of
mining operations. Therefore, the applicant needs to identify all alluvial
aquifers and provide the necessary baseline information in order to comply
with Rule 2.04.7(1).
Stipulation No. 11:
PRIOR TO SECONDARY OR RETREAT MINING AT THE ALLEN MINE, THE PERMITTEE
SHALL PROVIDE A HYDROLOGIC SURVEY IDENTIFYING ALL ALLUVIAL AQUIFERS IN,
OR ADJACENT TO THE PERMIT AREA (EXCEPT FOR THE PURGATOIRE RIVER ALLUVIAL
AQUIFER WHICH HAS ALREADY BEEN IDENTIFIED). THIS SURVEY SHALL CONTAIN
INFORMATION CONCERNING DEPTH BELOW THE SURFACE, HORIZONTAL EXTENT, WATER
USE, AND QUANTITY AND QUALITY OF GROUND WATER AS REQUIRED BY RULE
2.04.7(1). THE OPERATOR SHALL ALSO PROVIDE A DISCUSSION OF THE PROBABLE
HYDROLOGIC CONSEQUENCES OF MINING UPON THOSE ALLUVIAL AQUIFERS
IDENTIFIED.
With the acceptance of the above stipulations, the proposed operation is in
compliance with the requirements of.this section.
VII.
of Mining and Cumulat
The following cumulative hydrologic impact study (CHIS) has been prepared for
the portion of the Purgatoire River Basin above Madrid, Colorado, pursuant to
Rule 2.07.6(2)(c). This CHIS assesses the projected cumulative hydrologic
impacts of all anticipated mining operations in the general area of the Alien
Mine.
Mining operations included in the analysis include the CF&I Allen (CMLRD
Permit Number C-12-81) and Maxwell (CMLRD Permit Number C-13-81) mines. These
mines are existing underground mines located in the Stonewall and Picketwire
valleys within the Purgatoire River drainage. This assessment is based
primarily upon data and analysis contained in the Allen and Maxwell mines
permit applications, and upon the observations of Division personnel during
inspections of the mine site. Some additional analysis was performed by the
Division to complete the finding.
This discussion is divided into four major subsections: Description of the
Existing Environment, the Probable Hydrologic Consequences of Mining, the
Cumulative Hydrologic Impacts of Mining, and Continued Monitoring
Requirements. Surface and ground water are discussed separately in each
subsection.