. Standardization of mining methods; a series of important articles reprinted from Engineering and mining journal. 5» .J-XJ ^ n n ???) f !*^T~^ 1. is some question, vi^hen all is considered, whether, evenunder these circumstances, it would prove as efficient asiron piping. VENTILATION OF METAL MINES 45 In the mines in some districts stoppings are calledbulkheads. These are used to seal off dead workings,air leaks, or drifts and raises leading to stopes whichare not in operation. A stopping which may be adoptedas standard should be constructed as follows: Supposea drift is to be bulkheaded. The
. Standardization of mining methods; a series of important articles reprinted from Engineering and mining journal. 5» .J-XJ ^ n n ???) f !*^T~^ 1. is some question, vi^hen all is considered, whether, evenunder these circumstances, it would prove as efficient asiron piping. VENTILATION OF METAL MINES 45 In the mines in some districts stoppings are calledbulkheads. These are used to seal off dead workings,air leaks, or drifts and raises leading to stopes whichare not in operation. A stopping which may be adoptedas standard should be constructed as follows: Supposea drift is to be bulkheaded. The ground is first cut outaround the drift where the stopping is to be that, 4 x 6-in. posts are set up, three feet apart,across the drift. Then 1 x 12-in. boards are nailed tothe posts, making a partition. Metal lath is tacked onto the boards. In case metal lath is not available, doublewire netting with small-diameter openings may be fine coating of cement, i-in, thick, put on either byhand or with the cement gun, is then applied. If onlyold workings are to be sealed off, and it is desired thatsome air should be allowed t
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