The Marriott Drilling Group is the largest deep onshore deep drilling company based in the United Kingdom operating 19 drilling and workover rigs and a wide range of drilling and associated services to the oil, gas, shale gas, gas storage, coal, CBM, mining, water and geothermal industries and for specialised geoscientific drilling projects in Europe and selected international markets.
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Potash Exploration Results in World Class Discovery

August 2014

Marriott has recently completed a three-year comprehensive exploration programme for York Potash, a subsidiary of Sirius Minerals, in North Yorkshire. This world-class exploration programme utilising heavy duty mining wireline systems to core the evaporate deposits included seven geological exploration boreholes to depths up to about 1700 m. Two boreholes were also drilled down the centres of the two proposed deep mine shafts to investigate the ground conditions for shaft construction.

Notable is that eight side-tracks, typically from 1250 m, in the exploration holes were carried out successfully with inclinations up to 42o allowing additional coring to measured depths up to 1690 m to determine the geometry of the various evaporate layers to assist in the mine planning. In three boreholes, two sidetracks from the ‘mother’ borehole were achieved.

Three rigs were initially employed on this programme reducing to one for the final phase of the project.

This successful application of the use of heavy duty mining wireline systems illustrates the value of this approach for geological characterisation for such projects as well as investigations for radioactive waste disposal facilities, coal bed methane, minerals, coal mine development and geoscience with coring strings available for exploration to depths up to 5000 m.

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