2015-10-06_PERMIT FILE - C1981019A ‎(2)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 10/6/2015
• Doc Name: Special Mining Categories
• Section_Exhibit Name: Volume 15 Rule 2.06
• Media Type: D
• Archive: Yes

RULE 2 PERMITS
2.06 PERMIT REQUIREMENTS - SPECIAL MINING CATEGORIES
2.06.1 -3 Scope, Experimental Mining, and Mountain Top Removal
There will be no experimental mining practices at the proposed Little Collom X and Collom Lite pits.
2.06.4 Steep Slope Mining
Colowyo may request a variance for mining and reclamation for steep slope mining as specified in Rules
2.06.4(2) and 4.27.
2.06.5 Variance from Approximate Original Contour Restoration Requirements
The Collom mining area will include non - mountaintop removal steep slope surface coal mining and
reclamation operations. Colowyo is not currently requesting a variance from approximate original
contour in the post- mining topography (PMT), but maintains the option to pursue this in the future as an
amendment to this permit application or as a technical revision. The PMT as presented reflects the pre -
mining topography generally, with drainages and drainage divides remaining in their approximate current
locations. Some minor moderation in topography is expected due to limitations associated with
reclamation equipment. Post - mining topography is shown on Map 19C. Table 2.05.6 -5 presents the
mine -wide volumetric calculation in support of the PMT. The PMT is designed based on the CDRMS
rules for Operations on Steep Slopes as discussed in Section 4.27 of this document.
2.06.6 Prime Farmlands
Prime farmlands do not exist within the Collom permit revision boundary (see Section 2.04.12).
2.06.7 Reclamation Variance
There will be no delay in contemporaneous reclamation due to underground mining activities; therefore,
this section is not applicable.
2.06.8 Alluvial Valley Floor (AVF)
General
In 2005, Tetra Tech, doing business as Maxim Technologies, conducted a preliminary field investigation
and technical evaluation of the Collom permit expansion area, including Collom Gulch, Little Collom
Gulch, and Jubb Creek (including the West Fork), to determine the presence of Alluvial Valley Floors.
The investigation was conducted in accordance with Section 2.06.8 and OSM Technical Guideline. They
concluded that no alluvial valley floors exist in the areas to be mined. Their findings were submitted to
CDMG on September 23, 2005 in a letter, a copy of which is included in Exhibit 7, Item 24 of this
document, and referenced in appropriate sections below.
The mined area is located within Little Collom Gulch, and pits or spoils will occupy much of the Little
Collom Gulch valley bottom during the mining operation. Portions of the pits will lie within the adjacent
watersheds of Collom Gulch and the West Fork of Jubb Creek, but will not encroach on the valley
bottoms (Map 2313). The groundwater in the general area occurs principally in valley fill material
associated with the major stream valleys and to a lesser extent in the permeable and semi - permeable
bedrock strata (CDM, 1985a). As discussed in Sec�ion 2.04.7, the existence of groundwater in the per:,lit
expansion area is limited to perched systems tha primar1y discharge small amounts of water in the
Collom — Rule 2, Page 144 Revision Date: 9/28/11
Revision No.: PR -03