Mining or in situ disintegration of hard material – Processes – Mine safety
Patent
1980-01-30
1981-06-09
Purser, Ernest R.
Mining or in situ disintegration of hard material
Processes
Mine safety
299 16, 299 1, 166308, E21C 4108
Patent
active
042721288
ABSTRACT:
There is disclosed a method for more safely conducting an underground mechanical mining operation such as typically employs successive drilling, blasting, and product removing processes against a mine work face which is conducted from within an open mine room or the like in an underground deposit of salt. Such materials are per se impervious to fluid transmission therethrough but as they occur in underground deposits vicariously include pockets of or channels for outlet from traps of pressurized fluid accumulations, such as would be dangerous to the mining operation if inadvertently encountered incidental to the routine drilling and blasting processes. The method features, prior to each routine working face drilling and blasting operation; creating a safe environment therefor by first boring one or more exploratory hole(s) through means of a pressure-sealed casing into the salt deposit ahead of the mine working face to a depth beyond the region into which the subsequent mine face drilling and blasting operation is to be performed. The detritus from the boring operation is analyzed to detect evidence of any dangerous sources environmental to the projected mining operation. The bore hole is then "mini-fractured" at an analysis-determined optimum depth therein to monitor the environment in order to insure the safety of the subsequently to be performed routine mining operation.
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"Degasifying Before Mining," Coal Age, Aug. 1961, pp. 74-78.
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