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Jan 1, 1931

[Adams, Douglas K General Electric Co., P.O. Box 2331, Denver 1, Colo. Alger, Van Kaiser Steel, Sunnyside, Utah Allan,-Andrew Thompson Creek Coal & Coke Corp., Glenwood Springs, Colo. Allen, Earl W Mine Safety Appliances Co., 257 Rio Grand St., Salt Lake City, Utah Allen, John P Development & Resources Corp., 50 Broadway, N. Y. 4, N. Y. Allen, Thomas Chief State Coal Mine Inspector, State Services Bldg., Denver, Colo. Alston, George L Mine Safety Appliances Co., 201 N. Braddock, Pittsburgh 8, Pa. Anderson, Nephi W Book Cliffs Coal Co., Dragerton, Utah Anderson, W. J Texaco, Inc., 845 N. 5th E., Price, Utah Ankeny, Marling J U. S. Bureau of Mines, 5308 Roosevelt St., Bethesda, Md. Archer, Bryon J., Jr Peabody Coal Co., 421 Glenwood St., Grand Junction, Colo. Arentzen, E. M Lee-Norse Co., Charleroi, Pa. Arentzen, L. E Lee-Norse Co., 2975 18th St., Boulder, Colo. Artis, Cliff E Big Horn Coal Co., 247 Sherman Ave., Sheridan, Wyo. Atchison, Lee Atchison Construction Co., Drawer D, Aztec, N. Mex.]

Jan 1, 1963

[CURTIS M. BELDEN RMCMI PRESIDENT 1999-2000 on behalf of the RMCMI Board of Directors and Officers of The Rocky Mountain Coal Mining Institute cordially invites you and your family to attend the 96th Regular Meeting and Convention to be held June 25 thru June 27,2000 Durango, Colorado]

Jan 1, 1999

Jan 1, 1978

Amax Coal Inc. Colowyo Coal Company Continental Conveyor & Equipment Company Crane & Hoist Sales Cummins Southwest, Inc. Energy West Mining Company Paul J. Epley The Falkirk Mining Company Fleischli Oil Company T. J. Gundlach Machine Company Halbach & Braun Hemscheidt Corporation GH Hensley Ingersoll Rand Jennmar Corporation Joy Technologies K & P Sales Engineers, Inc. Kennametal, Inc. Kerr-McGee Coal Corporation L & H Welding McLanahan Corporation National Coal Association The North American Coal Corporation Northwestern Resources Company Peabody Western Coal Company Phillips Machine Service, Inc. Pincock, Allen & Holt The Pittsburg & Midway Coal Mining Co. Ramsey Technology, Inc. Roberts & Schaefer Co. Rust Tractor Company Salt River Project Schroeder Industries Smith, Barney, Shearson Snowmass Resort Association Southern Pacific Lines Stamler Corporation TerraMatrix TIC (The Industrial Company Wyoming, Inc.) Trapper Mining Inc. Wagner Equipment Company Western Energy Company Wheeler Machinery Company

Jan 1, 1993

The 1935 meeting will beheld in Denver, the exact date to be announced later. If you have any sugges¬tions for the place or program, send them to the Secretary at once.

Jan 1, 1934

By F. T. Baker

The Primero mine, operated by the Colorado Fuel & Iron Company, is located 17 miles west of Trinidad, Colorado, in Las Animas County. Unusually bad roof conditions, along with heavy side pressure and other conditions causing rapid decay of timbers, all combine to create a very serious timbering problem. The height of the coal averages six feet six inches. It is a heavy coking coal and has a tendency to become easily crushed and broken down in the seam. The seam lies about 35 feet below the sandstone and the intervening formation is composed of loose shaly rock, and as the coal is extracted, the air slackens this rock to such an extent that within 24 hours, roof falls varying from five to fifteen feet in height are likely to occur. Under these conditions it is necessary to use cross bar sets in both rooms and entries, and they must be spaced no further apart than three and one-half foot centers, and be maintained within a distance of three feet of the face. Rooms are spaced on fifty footcenters, and cannot with safety be driven to exceed 14 feet in width, and 200 feet in length. The large pillar must be maintained to protect from side pressure, and the rooms must be driven up and retreated with as quickly as possible to avoid the squeeze caused by the intense side and roof pressure. Best results in extraction have been obtained by driving rooms for only a distance of 150 feet. Under these circumstances, it is readily seen that timbers of small diameters cannot be utilized in timbering any development work of a permanent nature. Entries are driven nine feet wide, and special peeled piling with an average diameter of 12 inches are most commonly used. It, is necessary to use lagging between each set of crossbars . Conditions such as these necessitated an immense expenditure for mine timber. In addition to ordinary seven and eight foot props, we used a yearly average of 65,000 feet of heavy peeled piling, averaging in diameter from 10 inches to 12 inches. Annual expenditures for timber of all classes was in excess of $60,000.00. Timber costs per ton averaged around 29 cents. In view of these exceptionally severe timber conditions at Primero, the company, in 1920, had a survey made with a view of providing some remedy to this problem. A comparison of the life of main entry timber at other bituminous mines was made, and an average life of four years was established. The actual data collected at Primero indicated an average of less than two years in the manway or "return" airways, and up to five years on the haulageways or "intake" airways. While some of this timber will stand up for a much longer period than this, a close inspection will reveal in most cases that its period of usefulness is spent. It is very essential when discussing the life of timber, especially that used on, main haulageways and aircourses, that a distinction be made between the point of service, that is, the point where it is sound, serviceable and able to carry weight, and the point of breakdown or failure, where it is no longer sound and able to carry weight. In figuring the life of timber, the point of service only should be considered as timber will frequently stand for a considerable length of time when it is entirely decayed and unserviceable. The larger part of the timber used for our permanent work was Alpine Fir, or what is locally termed Red Spruce, and the supply of this I is gradually becoming depleted and has to be obtained at a point so distant

Jan 1, 1926

The 1936 meeting will be held in Salt Lake City, the exact date to be announced later. If you have any suggestions for the place or program send them to the Secretary at once.

Jan 1, 1935

The 1942 meeting will be held in Salt Lake City, June 10,11, and 12, at the Hotel Utah. ... If you have any suggestions for the program, send them to the Secretary at once.

Jan 1, 1941

Past President, A. Z. Dimitroff, Supervising Mining Health and Safety Engineer, Health and Safety, District H., U. S. Bureau of Mines, Denver, Colorado, opened the Fifty-eighth Annual Meeting of the Rocky Mountain Coal Mining Institute at the Hotel Colorado in Glenwood Springs, Colorado, at 10:30 a.m. His introduction of President Charles M. "Dock" Schloss follows: It is indeed a pleasure to call the meeting to order and to welcome you to this, the 58th regular meeting of the Institute. This morning I have the pleasant assignment of presenting to you a person who has been so active in the Institute, and has worked so closely with many of you, that I am sure most of you have known him much longer than I have.

Jan 1, 1962

Jan 1, 1962

[ADAMS, JOHN P. 0. Box 560-No. 6, Rock Springs, Wyo. ADDISON, HERBERT Big Horn Collieries Co., Colo. Bldg., Denver, Colo. ALEXANDER, JOHN 825 South Gaylord St., Denver, Colo. ALLAN, DAVID Gorham, Colo. ALLEY, GERALD 1340 Steele St., Denver, Colo. AMBLER. J. B c-o Ambler & Riter. Kearns Blde.. Salt Lake Citv. Utah ANDERSON, A. E. Midland Savings Bldg., Denver, Colo. ANDERSON, ARTHUR E...Colo. Utilities Corp., 730 Equitable Bldg., Denver, Colo. ANDERSON. FRANK Crosb Wyo. APPERSON, A. B Tramway Bldg., Denver, Colo. ARNOLD, G. O .Oak Creek, Colo.]

Jan 1, 1930

Jan 1, 1935

Jan 1, 2005

The 1933 meeting will be held in Denver in May or June, the exact date to be announced later. If you have any suggestions for the place or program, send them to the Secretary at once.

Jan 1, 1932

Jan 1, 1961

Jan 1, 1987

The 1932 meeting will be held June 8, 9 and 10 in the western section, place to be announced later. If you have any suggestions for the place or program; send them to the Secretary at once.

Jan 1, 1931

Jan 1, 1958

CLARK MOSELEY RMCMI PRESIDENT 1998-1999 on behalf of the RMCMI Board of Directors and Officers of The Rocky Mountain Coal Mining Institute cordially invites you and your family to attend the 95th Regular Meeting and Convention to be held June 27 thru June 29, 1999 Crested Butte, Colorado

Jan 1, 1998