PERMFILE123602

• Permit No: M1977208
• IBM Index Class Name: Permit File
• Doc Date: 9/14/1977
• Doc Name: REGULAR 112 PERMIT APPLICATION FORM
• Media Type: D
• Archive: No

Mining Plan
The Martin Marietta property was zoned GI, General Industrial, on
July 24, 1967 by tfie Coard of Cow~ty Cononissioners, Coulder County,
Resolution #59. Quarries, mining, and sand and gravel operations, are
permitted by the Boulder County Zoning Resolution Section XIV and Section
XV as ammended on October 4, 1971. All surrounding property is zoned
agricultural. Quarries, mining, and sand and gravel operations are per-
mitted as outlined i.n Section VII of the Boulder County Zoning Resolution.
Refer to the end of this exhibit for a copy of the zoning resolutions and
pertinent information concerning zoning. Some outlying properties have
been purchased by Martin Marietta in recent years which are zoned agri-
cultural.
The mining plan for Martin Marietta Cement, located southeast of
Lyons, Colorado, is very straight forward. The quarry is divided into
six segments which are designated Pit A through F. Pits A and Fare low
grade limestone. Pits B, C, D, and E are high grade limestone. Because
of the blending of the different grade ore to make the finished product,
two to four pits must be operated simultaneously.
Pits B, D, and E are located on an outcrop with the ore body dipping
to the east 6 degrees to 16 degrees. The overburden or waste material
overlying the ore body in these pits consist of: (a) 0" to 8" topsoil
capable of supporting grasses and certain crops; (b) 0' to 10' of clay
inundated with some weathered shale; (c) 0' to 75' of shaley rock. The
ore body is 14' to 16' in thickness. Pit C is located to the east of
Pit B. This pit is a continuation of Pit B with the Boulder Feeder Canal
and the Swede Ditch acting as a divider. C pit is relatively flat with
4" to 8" of topsoil capable of supporting grasses and some crops. Below
the topsoil is 10' to 15' of clay with some shale particles. Below the
clay is 0' to 75' of shaley waste rock. Below the ore body in Pits B, C,
D and E lies the codell sandstone formation.
Pits A and F lie to the east of the high grade limestone beds with
the ore bodies dipping to the east and southeast at approximately 10
degrees. Overlying the ore body is 0" to 8" of topsoil capable of
supporting grasses and some crops. However, approximately 30 percent of
the area is a weathered shale capable of supporting only cactus and the
tougher dryland grasses. In some of the area there are 0' to 20' of clay
inundated with shaley rock. In the remaining area, the shale is almost at
the surface. In these two pits, the low grade limestone ore body is from
0' to 82' thick. Directly below this ore body is lower grade limestone
not useable for the manufacture of cement.
Overburden is removed with a self-loading elevator scraper. Topsoil
is stockpiled for later reclamation use. Waste rock is drilled, blasted
and hauled to waste areas. The cre is drilled and blasted and hauled to
the plant site. Drill holes 4" in diameter are drilled with a rotary
percussion air track drill. Loading and hauling are accomplished by 10 cy.
loaders and 50-ton trucks.