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VII-i<br />

TABLE OF CONTENTS<br />

FORMULATION OF THE DRILL-HOLE DATABASE. . . . . . . . . . . . . . .. VII-2<br />

Drill holes available for use in reserve calculations . . . . . . . . . . . . . .. VII-2<br />

Brief history <strong>of</strong> drill holes that constitute the database . . . . . . . . . . . .. VII-2<br />

Hole locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. VII-3<br />

Drill-hole elevations<br />

VII-3<br />

Formation and ore-zone depths. . . . . . . . . . . . . . . . . . . . . . . . . .. VII-3<br />

Calculated mineral content and K 2 0 percentage <strong>of</strong> ore minerals<br />

VII-3<br />

Ore intercepts ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. VII-4<br />

Mixed ores . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. VII-4<br />

DEFlNmONS OF ORE RESERVES VERSUS ORE RESOURCES<br />

VII-5<br />

COMPUTATION OF ORE IN-PLACE RESOURCES . . . . . . . . . . . . . . . .. VII-6<br />

Brief review <strong>of</strong> previous estimates . . . . . . . . . . . . . . . . . . . . . . . .. VII-6<br />

Selection <strong>of</strong> a computer program to calculate in-place volumes and grades. VII-7<br />

Brief description <strong>of</strong> the MacGridzo program . . . . . . . . . . . . . . . . . .. VII-7<br />

Defmition <strong>of</strong> the gridded (study) area . . . . . . . . . . . . . . . . . . . . . .. VII-S<br />

Separation <strong>of</strong> the WIPP area from the study area . . . . . . . . . . . . . . .. VD-S<br />

Initial calculation <strong>of</strong> in-place resources . . . . . . . . . . . . .. VII-S<br />

Adjustment <strong>of</strong> in-place resources to mining height<br />

VII-9<br />

RESULTS OF ORE RESOURCE AND RESERVE CALCULATIONS . . . . . .. VII-9<br />

4th ore zone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. VII-9<br />

10th ore zone<br />

VII-ll<br />

Other ore zones<br />

VII-12<br />

REFERENCES<br />

VII-13<br />

TABLES<br />

Table 1. Ore zone data from USGS Op\ffi-file Repon 7S-S2S-. '.-~ : VII-I4<br />

Table 2. Resources and reserves <strong>of</strong> the 4th langbeinite ore zone<br />

VII-15<br />

Table 3. Resources and reserves <strong>of</strong> the 10th sylvite ore zone<br />

VII-16<br />

Table 4. In-place resources for other ore zones. (Tons in millions.) VII-I7<br />

FIGURES<br />

Figure 1. Method <strong>of</strong> potash reserve calculation . . . . . . . . . . . . . . . . . VII-18<br />

Figure 2. Thickness <strong>of</strong> the 4th ore zone<br />

VII-19<br />

Figure 3. 4th ore zone-% K 2 0 as equivalent1angbeinite<br />

VD-20<br />

Figure 4. 4th ore zone-% K 2 0 equivalent lang x thickness<br />

VII-21<br />

Figure 5. 4th ore zone equiValent langbeinite reserves (in place)<br />

VD-22<br />

Figure 6. 4th ore zone equivalent langbeinite reserves adjusted for<br />

mining height <strong>of</strong> 4.0 feet for entire gridded area<br />

VD-23<br />

<strong>Information</strong> <strong>Only</strong>

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