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6 <br />Surface hole - 10 inch hole <br />100 to 200 feet as appropriate to site, <br />lined with steel casing, plugged and cut <br />off below ground surface after drilling <br />Rotary drilled hole - 8 inch hole <br />200 to 5500 feet as appropriate <br />to site, <br />lined with temporary steel casing <br />cemented at base, <br />plugged as appropriate after drilling <br />and testing <br />Core hole - 6 inch hole <br />5500 to 6000 feet as appropriate <br />to site <br />RM Potash Exploration Plan, Figure 3. Drill hole cross section (not to scale)