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'94-03-02 14 46 PUEBLO TITLE P 5 • • Mr. Bob Oswald Division of Minerals ~ Geology March 2, 1994 Page 2 The Min:nq Map has been amended to provide the best estima- tion of details for depth and direction of mining. Without a more definitive core drilling program, the best estimation at this time is for a maximum of 10' of overburden and 20' of clay seam. Mining is proposed to proceed from the east pe- rimeter to the southwest with the same mining methods as describod in Phase I. Access is directly ncross the road from the access to Phase I. Other items are detailed on the map. ? It must be kept in mind that both the timetable and mining plan are but estimations at this time and can vary with brick demand and clay thickness. 5. Exhibit D mentions an overburden layer at depth of 2 to 10 fleet. Exhibit E states that "there riill be no spoil". Is this overburden to be regarded as distinct and different from spoil . Please clarif~y.~ WI/ G ~, This~s_a_matter ofi s~ emant:c To me, spoil is somewhat of ~ ir1`~ ~,v/ O _derogaCo~ te_rln_ whereas topsoi 1 and overburden are more ac-ll.. `75 ~'f curate terms for spoil :n this type of operation. However, ;4 ~(~,t4~ " poa-1_ pis probably a more accurate term when compared to the _ ore bod ~ -~ b. Exhibit D - underlying layer of shale not an ideal medium ~r~, for deep-rooted grasses. Concern about insufficient thick- ness of overburden. before topsoiling. What is the expected depth of the replaced overburden. As stated in 5, the "spoil" or 2 to 10 feet of overburden to ~ r/ be stockpiled and then spread for topsoiling is anticipated ~~L to be adequate for successful revegetation. ~ J/~ ~C 7 L 8 dealing with the Stormwater Discharge Permit and Stormwater Management Plan were covered in the previous let- ter of 3/1/94. 9. Information on Phase II and III on loction and timing. Exhibit E. Phase II and III have been shown on the mining map with timing projected as: Phase II - 2014 - 2030 Phase III- 2030 - 2040 Mining will start adjacent to the east perimeter and proceed southwest in the same manner as described for Phase I. It should be obvious that these time projections are just that. Projecting business demand 45 years ahead is a very nebulous task.