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GENERAL51479
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Last modified
8/24/2016 8:37:43 PM
Creation date
11/23/2007 6:50:23 PM
Metadata
Fields
Template:
DRMS Permit Index
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
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<br />-24- <br />DESCRIPTION OF THE EXISTING ENVIRONMENT <br />The study area is situated in the Park Plateau, a subdivision of the Great <br />Plains physiographic province, which consists of the dissected highlands that <br />separate the Nigh Plains to the east from the Rocky Mountains to the west. <br />The Purgatoire River flows through the study area and is one of the major <br />streams that drains the region. It forms in the Sangre de Cristo Range south <br />of the Spanish Peaks and has three major headwater tributaries; the North <br />Fork, Middle Fork and South Fork which converge near the study area. The <br />study area ranges in elevation from 7,000 to 9,000 feet. Cottonwood is common <br />on the floodplain of the Purgatoire River, whereas pinon, juniper, gambel oak <br />and mountain mahogany are common to the upland slopes. <br />A. Geology - <br />The principal structural feature of the region is the Raton Basin, abroad, <br />asymmetric synclinal basin with an axis trending north-south. The eastern <br />limb is gently dipping in the study area and steeply dips further to the west <br />outside the study area. The Raton Basin was formed during the latter phases <br />of the Laramide Revolution when the Sangre de Cristo Range was thrust eastward. <br />The applicant has submitted geologic maps (Map 6) and geologic cross-sections <br />(Map 7) with each application. The Maxwell and Allen Mines are located on the <br />western limb of the Raton Basin. The dip of the strata is 20 to the <br />northeast in the general area of the mines. The coal seam at the western <br />limit of the Allen Mine has a dip which increases to 14 to 16 degrees. <br />Several steep, normal faults, trending east-northeast have been mapped between <br />Weston and Starkville (Wood et al., 1957). Numerous faults have been mapped <br />in the Allen Mine workings. These faults are all high angle faults (almost <br />vertical) and have low displacements. The maximum measured displacement of <br />faults in the Allen Mine workings is between 15 and 17 feet. Most faults <br />pinch out within a very short distance. There are two major faults in the <br />area which are extensive. They strike N80oE. <br />The stream valleys overlying the existing Allen Mine workings do not appear to <br />be fault-controlled. The Allen Mine workings map, submitted on December 1, <br />1983, shows both surface streams and faults encountered during mining. No <br />extensive faults were encountered in the mine workings under the Middle Fork <br />of the Purgatoire River, Pete Canyon, or Apache Canyon. <br />/`~17 No faults have been encountered in the Maxwell Minim,. However, during mining, <br />1 ~qr' the applicant expects to encounter low displacement, high angle faults similar <br />;Lis ) to those encountered in the Allen Mine. <br />l/~~~Rock units in the Raton Basin range in age from Precambrian to Quarternary. <br />The stratigraphy of the study area consists of the Trinidad Sandstone, the <br />Vermejo Formation, the Raton Formation, and the Poison Canyon Formation. <br />
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