of the drill sections the outer casing of the drill section permits the introduction of high pressure fluid and includes a plurality of pressure responsive plugs adapted to rupture at a predetermined pressure value thereby releasing fluid to lubricate the drill string and reduce the torque encountered during the mining operation application_number US 23243981 A description fig1 depicts a hydraulic mining tool drill string composed of a plurality of interconnected drill sections 10 of the present invention and mounting a hydraulic mining tool 12 at its lower end the drill string is depicted lowered into a predrilled bore hole 14 which extends through the over burden 16 and into a mineral deposit 18 such as a tar sand formation in operation the entire drill string is rotated by conventional means from above ground surface and a high velocity liquid such as water is channeled downward through the drill string and discharged radially outward through the mining tool 12 to dislodge the viscous crude oil and sand particles from the formation 18 the dislodged oil and sand particles form an aqueous slurry with the liquid discharge which may be raised upward to the surface by way of a hydraulic jet pump disposed within the interior of the drill string a more detailed description of the operation of such hydraulic mining tools is disclosed in u s pat no 3 951 457 issued to redford and my co pending patent applications ser no 53 029 entitled 34 down hole pump with bottom receptor 34 and ser no 121.