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2010-08-10_REVISION - M1977493 (7)
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2010-08-10_REVISION - M1977493 (7)
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Last modified
6/15/2021 5:47:15 PM
Creation date
8/19/2010 8:11:52 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977493
IBM Index Class Name
REVISION
Doc Date
8/10/2010
Doc Name
Amendment to AM-06
From
Climax Molybdenum
To
DRMS
Type & Sequence
AM6
Email Name
ACS
Media Type
D
Archive
No
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Permit Amendment (AM -06) — Climax Mine <br />• cover is rock are referred to as talus. A list of some of the common plant species observed in the alpine <br />tundra and talus communities is included in Table J -2. <br />J -2.1.1 Alpine Tundra <br />Alpine tundra for the purposes of this document refers to all vegetated alpine communities including <br />mesic meadows, dry meadows, and fellfield plant communities. The alpine tundra encompasses 305 <br />acres (7.41 %) of the vegetated land within the affected area boundary (Table J -1). <br />Most of the 305 acres of alpine tundra at Climax (Table J -1) are mesic or dry meadow communities <br />dominated by grasses such as tufted hairgrass (Deschampsia caespitosa), alpine fescue (Festuca <br />brachyphylla), spike trisetum (Trisetum spicatum), slender wheatgrass (Elymus trachycaulus), bluegrass <br />species (Poa spp.) and alpine timothy (Phleum alpinum). Common forbs include Bering chickweed <br />(Cerastium beeringianum), sibbaldia (Sibbaldia procumbens), and Parry's clover (Trifolium parryiQ. On <br />slopes and in moist areas willow species dominate and include planeleaf willow (Salix planifolia) and <br />shortfruit willow (S. brachycarpa). <br />Fellfield plant communities are generally found on the windswept ridges above the open pit. These <br />communities are not as densely vegetated and are dominated by cushion plants which are deep- rooted <br />and low- growing plants such as moss campion (Silene acaulis), twinflower sandwort (Lidia obtusiloba), <br />and cushion phlox (Phlox pulvinata). <br />J -2.1.2 Talus <br />Talus refers to areas of loose, large rocks often aggregate on slopes and at the base of eroding cliffs. <br />Talus slopes range from small rock streams on otherwise vegetated slopes, to large fields and cirques of <br />rock. Talus slopes are generally steep and unstable. Rock movement often prevents soil development <br />and limits vegetation establishment. Plant communities that can develop and establish within the talus <br />areas are generally cushion plant communities like the plant communities that develop in fellfield <br />• environments. Fast growing species such as the native biennial Rocky Mountain thistle (Cirsium <br />scopulorum) also can establish on talus. Lichen species that grow on the talus slope rocks are the most <br />common species. Talus represents a relatively small portion of the proposed affected area (57 acres or <br />1.38% of the vegetated area), but will be an important reclamation community within the open pit area at <br />the end of mining. <br />J -2.2 Subalpine Communities <br />The subalpine ecosystem in Colorado lies between 9,500 feet and 11,800 feet. Thus, the remaining area <br />at Climax falls into this ecosystem. The most common vegetation community in the subalpine zone is <br />coniferous forest; however, aspen forests and subalpine meadows are also widespread throughout the <br />ecosystem. On the Climax property most of the historic mining disturbance has been in the subalpine <br />communities. Most of the subalpine communities with fairly level topography have been disturbed by <br />mining activities leaving most undisturbed subalpine communities on steep slopes. A list of some of the <br />common plant species observed in subalpine communities at Climax is included in Table J -2. <br />J -2.2.1 Subalpine Coniferous Forest <br />Coniferous forest is the most common vegetation community within the affected area with 1,358 acres <br />representing 32.98% of the vegetated area. Colorado's subalpine coniferous forests are generally <br />dominated by Engelmann spruce (Picea engelmannii) and subalpine fir (Abies lasiocarpa). Both of these <br />species are present at Climax, but Engelmann spruce is clearly the dominant species at Climax. <br />Subalpine fir populations do exist but are limited in their extent. Bristlecone pine (Pinus aristata), limber <br />pine (P. flexilis), and lodgepole pine (P. contorta) are also locally common on the mine site. On the <br />slopes around Mayflower TSF, lodgepole pine is co- dominant with the Engelmann spruce. <br />The understory of the coniferous forests is generally sparse, but common understory species include: <br />heartleaf arnica (Arnica cordifolia), woodland strawberry (Fragaria vesca), Jacob's - ladder (Polemonium <br />pulcherrimum), gooseberry (Ribes montigenum), American red raspberry (Rubus idaeus), dwarf bilberry <br />(Vaccinium cespitosum). <br />• Exhibit J J -2 May 2010 <br />(Page Revised August 20 10) <br />
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