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<br /> <br /> <br />INDUSTRIAL RESOURCES, INC. <br />PRELIP1INARY ROC Y, f~1ECHANICS EVALUATION <br />1.0 INTRODUCTION <br />A laboratory rock mechanics testing program was conducted by Dowell, <br /> <br />Inc. on selected core samples which were taken from holes drilled in <br />conjunction with the Industrial Resources' 1983 Bulk Sampling Project on <br />Sodium Lease C-0119986, Rio Blanco County, Colorado. Tests were conducted <br />on core samples that comprise the roof material as well as the mining zone <br />(Boies Bed). Calculations were made by Cliffs Engineering, Inc. with these <br />data as a basis, to preliminarily determine roof spans and pillar <br />dimensions for an underground solution mine. The general direction in the <br />mine design is for zero subsidence, However, if subsidence were to occur <br />for whatever reason, the proposed mine cavity configuration is designed to <br />minimize the potential adverse effects of any subsidence. In addition, a <br />subsidence monitoring plan is proposed that is intended to verify the mine <br />design parameters for future use in designing a commercially-sized solution <br />mine. <br />The extent of any disturbances associated with the operation of the <br /> <br />proposed pilot solution mining operation will be quite limited. A total of <br />only four cavities (three new cavities and continued operation of the small <br />cavity initiated during the Bulk Sampling Phase) will be be used during <br />pilot solution mining operations. The areal extent of the well field <br />s~~ <br />Cfli~s fl~gineerflllg, IIr~C• RIFLE, COLORADO 81650 <br />1-1 <br />