_GENERAL DOCUMENTS - C1981017 ‎(252)‎

• Permit No: C1981017
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Name: Bid Documents ‎(IMP)‎ 1993 Correspondence
• Permit Index Doc Type: General Correspondence
• Media Type: D
• Archive: No

U. S. Department of Labor Mine Safety and Health Administration "J.7
P.O. Box 25367
Denver, Colorado 60225-0367
Coal Mine Safety and Health T
„G 'j•
District 9 1 11, 1
AN 2 3 l W
J. A. Reeves, Sr. 1 �'
President
Mid-Continent Resources Inc. ,�(�� • '� �.'�
P. O. Box 500
Carbondale, CO 81623
RE: Dutch Creek Mine, ID No. 05-00301
L. S. Wood, ID No. 05-00300
Bear Creek, ID No. 05-00310
Coal Basin, ID No. 05-02342
Ventilation System and Methane
and Dust Control Plan Amendment
Dear Mr. Reeves:
The enclosed plan amendment, dated June 17, 1993 , consisting of a
cover letter, four- page plan and mine maps, plus the item as
discussed and noted between John Reeves, Jr. and W. P. Reitze on
June 29, 1993, addressing the sealing of the portals of the subject
mines, is hereby approved in accordance with 30 CFR 75. 370(a) (1) .
1. Be reminded that solid cinder block seals will be required to
meet 30 CFR 75. 335, which states, in pertinent part that:
§ 75.335 Construction of seals.
(a) (1) Each seal constructed after November 15, 1992, shall be—
0) Constructed of solid concrete blocks at least
6 by 8 by 16 inches, laid in a transverse
pattern with mortar between all joints;
(ii) Hitched into solid ribs to a depth of at least
4 inches and hitched at least 4 inches into
the floor;
(iii) At least 16 inches thick When the thickness
of the seal is less than 24 inches and the
width is greater than 16 feet or the height is
greater than 10 feet, a pilaster shall be
interlocked near the center of the seal. The
pilaster shall be at least 16 inches by 32
inches; and
Cv) Coated on all accessible surfaces with
flame-retardant material that will minimize
leakage and that has aflame-spread index of
25 or less, as tested under ASTM E162-87,