PERMFILE59877

• Permit No: M1994117
• IBM Index Class Name: Permit File
• Doc Name: LIMITED IMPACT OPERATION 110 RECLAMATION PERMIT APPLICATION PACKAGE
• Media Type: D
• Archive: No

•
I•
I•
I•
I•
I•
I•
I•
1•
•
operation through the period between November 1 and May 31. ~M~~°•'°+P* ,w
ese mine workings um ing water out of the Wynona
mine shaft.
,~- ~ -_ ~
C.O.M. Inc.'s concentration mill ie housed in a metal building 70 feet wide, 120
feet long, and 30 feet high, with three separate working levels. A metal frame
building was rnnetrucbed on a concrete foundation with an upper elevation of
8,590 feet, an intermediate elevation of 8,595 feet, and a lower elevation of
8,575 feet (see Map A). The upper terrace supports the crushing plant and the
grinding circuit, the middle terrace contains the gravity concentration circuit,
and the lower terrace encloses the flotation concentration circuit. Construc-
tion of these three levels, and the two retaining walla that separate the middle
level, required some excavation of the underlying granite, and inwlved cut and
fill grading. Excavation of the site, and construction of the retaining and
foundation walla, was followed by the installation of the heavy crushing and
milling equipment. Special reference was given to the support of the heavy or
vibrating machinery that was used in the milling process, and substantial,
separate foundations were included in the mill building~a design. The erection of
the steel frame, and the attachment of the metal wall and roof panels, pro-
ceeded along with the necessary plumbing and electrical work. An internal
wall, insulated on both sides to reduce noise and duet, separates the crushing
plant from the grinding circuit on the upper level of the mill. Three coarse ore
bins, one fine ore bin, and a thickener tank were fabricated from steel at the
millsite. The total amount of the surface acreage affected by the constructon
of this building, the three coarse ore bins, and the associated receiving and
shipping areas of the milling facility ie 0.389 acres.
A 30 by 40 foot metal building is planned to house an assay laboratory and mill ~ ~,Q ~ "Z
office was built following the completon of the milleite. This building was con- `~'b`r"°„y~! `-
atructed southwest of the millsite, on the patented Oscar Lode, between the
8,590 and 8,595 foot contour interval (see Map A). the total affected land sur
face that was involved in the construction of this building was 0.027 acre ~~yr^~
If any other structures or buildings are found to be necessary for the safe or
efficient operaton of this milling complex, they will be built in the area encom-
passed by the boundaries of this permit application. All of the structures will
have the same color of metal aiding, and will be built in accordance with
Boulder Counts building codes and regulations.
Because the mill processes both gold-silver tellurides and various combinatone
ofgold-silver sulfides, it was designed as a composite system of gravity and
flotation concentraton. The ore processing flow chart shows diagrammatically
the sequence of operatona that take place in the plant (see Figure 1). It is a
simplified version of the flow sheet that was used to design this concentraton
mill. 'Ilia flow sheet was developed to decide the number, types, sizes, and
capacities of the processing machinery that were installed in the m''11ing facil-
ity. This information determined the positions of the machinery with respect
to one another, and the quanttee of ore end water that are in transit at every
point throughout the mill. Power requirements for each piece of equipment
I•