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Walstrum Spur Amendment, Exhibit D- Mining Plan April 2021 <br />Mining of the affected area of the 8-acre Parcel B2 will occur in conjunction with mining of the west side of the <br />Existing Quarry. A portion of this parcel, depicted on Exhibit C-3, will remain undisturbed as a screening buffer as <br />viewed from Highway 6. The overall timeline for mining the Spur Amendment is 30 to 50 years. <br />Existing Quarry Timetable <br />Mining in the Existing Quarry will occur concurrently with mining in the Spur Amendment area. The reason for <br />mining both areas at the same time is that the resource quality in the two areas is different. Material in the Spur <br />Amendment is of a higher quality and will be blended with material from the Existing Quarry. In this manner, <br />mining in both areas will occur at roughly half the rate that would occur if only one area was being mined. <br />In general, the Existing Quarry will be mined in a counterclockwise manner. Current mining will continue with the <br />existing benches on the east side, then the north side, then the west side. The overall timeline for mining of the <br />remaining areas of the Existing Quarry is 20 to 50 years. <br />3.6 Nature of Deposit <br />(f) A map (in Exhibit C- Pre-Mining and Mining Plan Maps(s) of Affected Lands, Subsection 6.4.3) may be used <br />along with a narrative to present the following information: <br />(i) nature, depth and thickness of the ore body or deposit to be mined and the thickness and type of <br />overburden to be removed (may be marked "CONFIDENTIAL, " pursuant to Paragraph 1.3(3)); <br />(ii) nature of the stratum immediate/y beneath the material to be mined in sedimentary deposits. <br />Exhibit C-3 shows the Affected Lands. <br />In the Spur Amendment area, there is typically less than 1 foot of topsoil overlaying 4 feet of silty sand colluvium <br />i�� 5 feet o#-�veatlaer grretss before Y� �rt�ppro�cimat�y� #ee� �he majerit��� _-- <br />the disturbed area has a soil classification of Cathedral-Rock outcrop complex. This soil type typically has only a <br />10- to 20-inch depth to lithic bedrock and no soil over bedrock in the rock outcrop areas which cover a substantial <br />portion of the disturbed area (see Exhibit I Soils Information). Topsoil is relatively absent from this operation as <br />confirmed by test pits dug on-site in 2020 (see Geotechnical Stability Exhibit). The bedrock is a metamorphic rock <br />including layers of Biotite Gneiss, Feldspar Gneiss, Hornblende Gneiss, and Interbedded Gneiss. The average <br />thickness of the deposit is more than 600 feet. The Geotechnica/ Stabi/ity Exhibit included in this application <br />presents a summary of the geologic investigation describing the nature and depth of the aggregate material and <br />overburden in more detail. <br />3.7 Commodities to be Mined <br />6.4.4(g) Identify the primary and secondary commodities to be mined/extracted and describe the intended use; <br />The primary products produced from the Existing Quarry are and will continue to be aggregates for use as <br />construction materials. No secondary commodities will be extracted. <br />3.8 Intended Use of Incidental Products <br />6.4.4(h) name and describe the intended use of all expected incidental products to be mined/extracted by the <br />proposed operation <br />The overburden will be processed into road base product. The gneiss rock will be processed into the aggregate <br />products. No other incidental products will be produced. <br />3.9 Explosives <br />6.4.4(i) Specify if explosives will be used in conjunction with the mining (or reclamation). In consultation with the <br />Office, the Applicant must demonstrate, pursuant to Subsection 6.5(4), Geotechnical Stability Exhibit, that offsite <br />areas will not be adversely affected by blasting. <br />� TETRA TECH P a g e 6 � 9 <br />