Technical paper . e LakeSuperior iron-mining region. The rules suggested by the Bureauof Mines a have been adopted, either in full or in a modified form,by many of the companies. Some companies print a list of sell explosives, fuse, etc., to their contract miners at a suffi- a See list of publications appended, particularly Bulletin 17. 24 MINE-ACCIDENT PREVENTION, ciently high price to restrict greatly the tendency to waste explo-sives or to leave them carelessly about the mine. Some companiesstore underground supplies sufficient for a day; others store under-ground several days su
Technical paper . e LakeSuperior iron-mining region. The rules suggested by the Bureauof Mines a have been adopted, either in full or in a modified form,by many of the companies. Some companies print a list of sell explosives, fuse, etc., to their contract miners at a suffi- a See list of publications appended, particularly Bulletin 17. 24 MINE-ACCIDENT PREVENTION, ciently high price to restrict greatly the tendency to waste explo-sives or to leave them carelessly about the mine. Some companiesstore underground supplies sufficient for a day; others store under-ground several days supply, but none stores a large quantity ofexplosives underground. Some have no magazine underground,but compel their men to care for their own stock of explosives;others have well-built and carefully protected magazines. Onaccount of the rapid introduction of explosives that thaw at lowtemperatures (low-freezing dynamites) and of their general use iniron-ore mines a thawing kettles are no longer used at many mines,. Figuee 3.—Shaft house on Marquette range. Note concrete platform about shaft house; gatesguarding cages, which are themselves closed; and bell box covering bell that can be rung byman in cage. and the systems of thawing and warming explosives have been ma-terially modified within the past year. Some companies haveintroduced hot-water thawing systems, but exhaust-steam or elec-trical heating systems are most commonly used. Descriptions follow of a few typical methods of handling explo-sives from the time when they are received at the mine until theyare delivered to the miner. The systems described are selected a. The explosives company selling the greater part of the dynamite used in this region has increased itssale of low-freezing dynamite to some 85 per cent of its total sales for these iron mines, and diminishedits proportionate sales of gelatin dynamite to about 3 per cent. HOW EXPLOSIVES AKE HANDLED. 25 from those seen on inspection trips in various iron-minin
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
