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SENECA MINE
<br />l_OG OF BOREHOLE
<br />Bore Hole: M-I GW-42
<br />Project: 0260
<br />Date/Time: Start: 7-29-81 Finish 8-2-81
<br />Location: NE, SE Section I I, TSN, R87W
<br />Routt County, Colorado
<br />Logged By: J.E. Cocraft
<br />Surface Elevation: 7318.2'
<br />Total Depth: 194'
<br />Bid Types: 4-7/8 Diamond Core
<br />Geophysical Logs:
<br />Driller: Jce Arguello
<br />Rig Type: Rotary (Mayhew 1000)
<br />Borehole Diameter:
<br />Drilling Fluid: Water
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<br />DEPTH DESCRIPTION AND COMMENTS
<br />0.0 to 2.9 Soil - "A-B" soil horizon, light to dark brown, 90% clay, 10% silt,
<br />contains calcite and FeO2, roots from 0 to apprximately 2.9'.
<br />2.9 to 4.0 Soil - "B"/"C" sail horizon, caliche, white, light brown, 60% calcite,
<br />~ clay, contains some FeO2 nodules
<br />4.0 to 13.0 Weathered Shale/Soil -Light brown, brown, 60% clay, 40% silty with •
<br />inter edded calcite nodules and FeO2 nodules.
<br />13.0 to 14.7 Weathered Shale/Soil - Light brown, brown, very fine grained,
<br />san stone wit some silt and mudstones.
<br />14.7 to 20.5 Shales Sandstones and Cla s -Light brown, gray, weathered shales,
<br />wit interb e~ clay, mud and siltstones, also contains interbedded
<br />FeO2 deposits, abundant in fractures.
<br />20.5 to 86.1 Shale -Light grey, dark gray, massive, some fossils and plant debris,
<br />fine x-talline to carbonaceous, interbedded with very fine x-tglline,
<br />calcareous sandstone, with calcite veins and calcite cement from 74.0
<br />to 74.9 and at 79.5 to 80.0.
<br />86.1 to I I I.0 Shale - Gray, massive with sea shells, contains more silts and fine
<br />grained sandstone, slightly calcareous with calcite laminations, some
<br />sandstone lenses. ranging from I mm., several found at approximately
<br />92.0'.
<br />I I I.0 to 117.7 Sandstone - Darl< gray, very massive, some coal present, goes from silt
<br />to very fine grained sandstone, with some sea shells and calcite
<br />laminations, contains alternating light and dark bands representing
<br />coal as the dark bands up to 117.7', calcareous. •
<br />117.7 to 122.4 Lennox Coal - 131ack, massive, bosky, dull shiny luster and shiny on
<br />fresh surface, conchoidalfractures, soft, dense.
<br />6-37a MOV 2 S 1981
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