Shaft Sinking Record at San Mauricio

Media

Part of The Marsman Magazine

Title: Shaft Sinking Record at San Mauricio
Language: English
Year: 1940
Rights
Fulltext: Spokane shaft head frame. SHAFT SINKING RECORD AT SAN MAURICIO During the month of December, 1939, the Spokane shaft of the San Mauricio Mining Company was sunk from a depth of 195 feet to a depth of 313 feet, or a total of 118 feet in very hard granite gneiss. It is a 3-compartment shaft and is 7 feet by 18 feet outside of the timber. While this footage would not be considered particularly noteworthy by any of the large shaft sinking or development companies, it is excellent work for shaft sinking in routine mine operations. It is a record footage for this district, and considering the hardness of the rock, it is probably a sinking record for the Philippine Islands. The sinking operations at this shaft are on an 8-hour, 3-shift basis, under the supervision of Fritz N. Carpentier. Each shift has a personnel of 1 capataz, 10 shaftmen, 2 topmen, 1 compressor operator, and 1 pumpman. The entire Filipino crew are natives of the Bicol region and have received all of their mining experience at San Mauricio. All work including timbering is done by the regular shaft crews. One of the three record - break·inu shaftcrews. Figure 2-Showing aetails of "Mucking Pan" device. THE MARSMAN MAGAZINE for February, .1940 9 Spokane shaft headframe. SHAFT SINKING RECORD AT SAN MAURICIO During the month of December, 1939, the Spokane shaft of the San Mauricio Mining Company was sunk from a depth of 195 feet to a depth of 313 feet, or a total of 118 feet in very hard granite gneiss. It is a 3-compartment shaft and is 7 feet by 18 feet outside of the timber. While this footage would not be considered particularly noteworthy by any of the large shaft sinking or development companies, it is excellent work for shaft sinking in routine mine operations. It is a record footage for this district, and considering the hardness of the rock, it is probably a sinking record for the Philippine Islands. The sinking operations at this shaft are on an 8-hour, 3-shift basis, under the supervision of Fritz N. Carpentier. Each shift has a personnel of 1 capataz, 10 shaftmen, 2 topmen, 1 compressor operator, and 1 pumpman. The entire Filipino crew are natives of the Bicol region and have received all of their mining experience at San Mauricio. All work including timbering is done by the regular shaft crews. One of the three record - breaking shaftcrews. °"'4 ZI .3 A 30-hole and cut round, a diagram of which is shown in Figure 1, is used to great advantage. This type of round minimizes timber breakage and piles the muck in one end of the shaft which is a great help in "mucking pan" operations. Drilling equipment consists of 3-3-inch drifters equipped with handle bars and chucks for 1~" round lugged steel, 6-55-lb. machines of the jackhammer type with chucks for 7 /8" hex. steel, and 3-55-lb. moilers. The drilling is done with 3 drifters and 4 jackhammers. A round is usually drilled out and blasted in 8 hours. 60% gelatin dynamite is used with electric detonators from 0 delay to No. 9. It was in the mucking portion of the cycle that the greatest amount of time was saved. This was accomplished by the use of the "Mucking Pan" which, while it has been used in other places, was further developed by Mr. Carpentier to fit conditions here. The main feature of this operation is the ability to get the cage to the bottom of the shaft at all times. This is accomplished by means of an extension head on the cage to which are attached extension shoes. This is illustrated in Figure 2. The mucking pan is constructed something like the body of an open end car. The sides are about a foot high and obviate the high lift usually encountered in mucking. The men turn the open side toward the muck pile and roll the material in. Its t:l -o -::..-=.---:..-:..-:..-_·:.:: .. -_-..t> I -====.:oa ~.::tJ-5 ti 96' 7 2 c =::..-=::.. -=-= ·:::.D / lo c===-=----.:=.::::::::o 0 c:-:::: =.:...D 2 c.:04 0 6 80. /0 c = =-:.:::===::..::..:.:xi 0 c.== ==02 c::c 4 06 -- -::..:::::::.:::::.:.:0/ - -----:::O 3 ' \;"AJiil*fP' t UJ t fpLX: ,cp11 11 II II 11 11 ,1 II II II II ll 11 11 II II II 11 II 11 u 10 ti 11 I I /I I I I/ I/ , , v ,, II ,, " LJ San A1trvr/<:t"o ,4/iml?y C'oml'any 30-llole Bhol"t Rouxcl II II II 11 11 ,1 ,, ,, ,, ,, ,, ,, Ll 1: 11 II 11 11 LL Figure 1 THE MARSMAN MAGAZINE for February, 1940 installations are shown in Figure 2. DATA FOR DECEMBER, 1939. Miscellaneous No. of 8-hour shifts worked . . . . 93 Man shifts . . . . . . . . . . . . . . . . . . . . 1360 Total advance ............... . Number of rounds blasted ..... . Sets of timber placed ......... . 118 feet 21 18 capacity is about 20 cubic feet and when loaded is hoisted and dumped into the car on the cage. The pan is handled with a tugger hoist that is located a short distance above the mucking operations. The maximum lift required to dump is about 8 feet. Muck is removed as fast as cars can be hoisted and lowered. 75 cars have been mucked in one 8-hour shift. Timber must be kept within 45 feet of the bottom to allow the cage to operate. Total lost time ............... . Average blasting cycle ....... . 96 hours 35 hours All timbering is done by the regular shaft crew. 10 x 10 ·Oregon pine is used with 1" hanging rods. Sets are spaced at 6' centers with 5" x 6" Apitong guides. Timbering is kept to within 45 feet of . the bottom. Advance per round blasted ..... . Drill steel used per· round 5.6 feet 246 bits Cost Per Foot Per Foot Labor (Including Bonus) Explosives .................... . Timber ....................... . Other Supplies ................ . Supervision (Capataces) ....... . Mine Distributive (Staff Supervision, Machine Drills, etc.) .. . Power ........................ . Engineering ................... . Assaying ...................... . P36.59 6.57 9.91 4.32 1.48 7.71 1.83 0.41 In order to·. do away with the necessity of handling the large heavy pumps that are necessary for high lifts, we install a 5 H.P. centrifugal pump at each 100 feet of depth. These are all connected to one starting box and pump in series. If a greater amount of water is encountered than can be handled over 100 feet of static head by a 5 H. P . pump, we will install the pumps of the necessary size. Pump Total Cost Per Foot . . . . . . . . P68.82 PAINTS, VARNISHES, ENAMELS, WATERPROOFING PREPARATIONS, TECHNICAL PAINTS I. TO PROTECT: 2. TO RESIST: 3. TO PREVENT: Buildings Railways and Tramways Steamers Machinery Cranes, Hoists, Fences, Standards. Sun, Salt Air, Rain Acids and Chemical Fumes Alkalies, Sulphur, Caustic Soda Acids, Alcohol Fermentation. Rust and Rot Deterioration Mildew. 4. TO CONSERVE: Your investment and to protect your property against deterioration. 5. EVERSEAL PRODUCTS have been awarded Gold medals, highest award. 6. Exclusive distributors for Philippine Islands:MARSMAN TRADING CORPORATION, Manila. Rerseaz >-It a;w;;.&WW •mwZE·a-·& . ..; --- --.. -Manufacturers of Paints, Varnishes, Enamels, Waterproofing Compounds, Technical Paints, Insecticides. Executive offices: Fisk Building, Broadway and Fifty Seventh e<treet, New York Factory and laboratories: Ridgefield, New Jersey THE MARSMAN MAGAZINE for February, .1940 11 These are two of the shaft sinking crews who made record time at San Mauricio.