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2 • 56 <br />2.5.2 STRUCTURE <br />• The tease block lies northeast of the Garmesa Anticline which lies on the extreme southwest <br />flank of the Piceance Basin. Regional dip is between 2 and 3 degrees northeast into the basin. <br />Within the McClane Canyon Permit area is anortheast-southwest trending graben. The graben is <br />bounded by two high angle normal faults (See Fgures 2.5-2, 2.5-3) both with vertical <br />displacement at the Cameo coal seam of approximately 100'. The McClane Canyon Portal <br />enters the Cameo seam at the western boundary of the graben. The true graben width at the <br />portal is approximately 1500'. <br />Northeastward from the portal, the eastern fault trends about North 38° East as defined <br />from mining, drill holes, and surface exposures. The western fault appears more nonlinear; <br />possibly fragmenting into multiple smaller faults. Indication of the graben widening to the <br />northeast is derived from a northwesterly driven probe driven from a point 2600' northeast of the <br />• portal. The probe failed to intersect the fault at the anticipated location, and was abandoned <br />because of poor mining conditions. South of the portal the status of both faults is unclear. <br />There are recoverable reserves adjacent to the graben on the western, upthrown side. The <br />block's western boundary would be the outcrop on the east side of East Salt Creek canyon. The <br />extent of recoverable reserves between the graben and the outcrop is undetermined, because <br />burned outcrop to the west and the undetermined location of the fault to the east. <br />Fgure 2.5.2 (Section A-A~ is a view due North and all data and interpretation on this <br />cross-section are in the plane of section. This view shows the mined width of the graben at the <br />McClane portal, and projected mine development to the eastern permit boundary. After <br />completion of the rock slopes the mains will be developed approximately along this cross•section <br />• as referenced in the development map (Figure 2.1-1). <br />M~ Volume 1 4-2996 <br />