2020-08-09_PERMIT FILE - M2020041

• Permit No: M2020041
• IBM Index Class Name: Permit File
• Doc Date: 8/9/2020
• Doc Name: Application
• From: Kilgore Companies
• To: DRMS
• Email Name: ECS
• Email Name: MAC
• Media Type: D
• Archive: No

Peak Ranch Resource
August 5, 2020
Qg Terrace gravel(Holocene to middle Pleistocene)—Moderately sorted sand and gravel adjacent to
modern flood plain of Blue River and Straight Creek. Clasts as large as 1 m composed of Proterozoic gneiss
and, in Blue River Valley, subordinately of Dakota Sandstone, Maroon(?) Formation, and Tertiary intrusive
rocks. Clasts larger than about 1 cm are moderately rounded to well rounded. Includes deposits of lower
terrace levels along Blue River that were part of active alluvial channel prior to completion of Dillon Dam,just
south of quadrangle boundary, in 1962. Three terrace levels mapped by West(1978):a topographically lower
Holocene terrace, an intermediate terrace of Pinedale age, and a high terrace of late Bull Lake age. The
Pinedale terrace is about 10 m above river level;one colluvium-mantled Bull Lake terrace, about 45 m above
river level, is preserved near center of Sec. 22, T 4 S., R. 78 W. Thickness as great as about 15 m.
Kellogg (2002) mapped these units as being ubiquitous along the Blue River, and both units are valuable
aggregate resources. Tweto(1973) mapped the Upper Cretaceous Pierre Shale as outcropping on both sides
of the Blue River adjacent to the Peak Ranch Resource permit area. Kellogg (2002) described the Pierre
Shale as follows:
Kp Pierre Shale, undivided(Upper Cretaceous)—Dark-gray, grayish-brown, and black fissile marine shale
and mudstone in approximately lower 300 m;calcareous in lowest 10-20 m. Grades upward into a sequence
of dark-gray and black silty shale and mostly thin, brown, clayey, commonly ripple-laminated, fine-grained to
very fine grained sandstone. From top to bottom in quadrangle, divided into three informal members:shale
and sandstone member, sandstone member, and lower shale member. Undivided Pierre Shale is mapped
where exposures are too poor to determine stratigraphic position. Pierre Shale may have been as thick as
about 2,600 m in region. Upper approximately 1,000 m removed by erosion(Izett and others, 1971).
7.2 Drill Hole Logs
Peak Materials submitted an exploration permit,#P2018-001, to the DRMS on March 22, 2018 and
subsequently drilled exploration drill holes in April 2018. Logs of the four drill holes located on the corners of
the property are provided in Table D-4, below. They properly characterize the geology of the property.
Table D-4: Exploration Drill Logs
Drill Hole Drill Hole .. Note
Drill Hole 1 (NW corner) 0-2"Topsoil Completed on April 17,2018
2"-l'Silty Clay
1'-2'Silty sand with gravel
2'-10'Sand and gravel with cobbles
10'-13'Cobble with gravel,sand
13'-39'Sand and gravel with scattered cobbles
39'-62'Dense cobbles with sand and gravel
62'-67'Weathered shale
Drill Hole 2(NE corner) 0-2"Topsoil Completed on April 17,2018
2"-8"Silty Clay
8"-2'Sandy clay with gravel
2'-3'Sand and gravel
T-10'Sand gravel with scattered cobbles
10'-21'Cobbles with sand and gravel
21'-40'Sand and gravel with scattered cobbles
40'-47'Dense cobbles with sand and gravel
47'-52'Weathered shale
Drill Hole 7(SW corner) 0-2"Topsoil Completion date note recorded
2"-1'Silty Clay
1'-2'Silty gravel
4'-11'Cobbles with sand and gravels
I V-15'Sand and gravel with scattered cobbles
15'-24'Cobbles with sand and gravels
24'-47'Sand and gravel with cobbles
47'-58'Cobbles with sand and gravel
58'-62'Weathered shale
Gny,txwicki aeJ:Usueiates,YLL<' D-7
O TETRA TECH