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The rig was originally built to meet the demand for a more powerful mobile drilling rig, specifically a demand for rigs capable of boring up to 260 feet (79 m) deep. [2] At the time, Big Stan was claimed to be the largest portable drill rig in the United States, [3] with some estimates placing it as the largest vehicle-mounted drill rig in the ...
Zapata Off-Shore accepted an offer from an inventor, R. G. LeTourneau, for the development of a mobile but secure drilling rig. Zapata advanced him $400,000, which was to be refundable if the completed rig did not function, followed by an additional $550,000 together with 38,000 shares of Zapata Off-Shore common stock when it did.
Drilling rigs used for rock blasting for surface mines vary in size dependent on the size of the hole desired, and is typically classified into smaller pre-split and larger production holes. Underground mining (hard rock) uses a variety of drill rigs dependent on the desired purpose, such as production, bolting, cabling, and tunnelling.
The Schramm T685 WS truck mounted drill bored a 5.5 inches (14 cm) hole that, on 22 August 2010, was the first to break through to the 33 trapped men, confirming they had survived the accident. [9] The company also manufactured the T130XD air core drilling rig owned by Geotec S.A., a Chilean-American joint venture drilling company.
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