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I INTRODUCTION <br /> This Exhibit D provides background information about the Revenue mine and milling operations <br /> and includes the information required by Rule 6.4.4 a through j. References to other Exhibits are <br /> provided where necessary. <br /> 2 NHNING METHODS <br /> The ore deposits being mined at the Revenue Mine are vein type following igneous intrusions in <br /> the San Juan Formation. All mining will be conducted underground via drill and blast methods <br /> commonly used to mine these types of deposits.No surface or open pit mining will occur within <br /> the permit boundary. Surface disturbance will be limited to buildings, tailings storage facilities <br /> (TSFs),waste rock stockpiles, and other surface features needed to support underground mining. <br /> The annual production of mined material will be approximately 150,000 tons with approximately <br /> 20% of that being waste rock and the rest being ore. This gives a breakdown of 20,000 tons of <br /> waste rock annually being brought to the surface, and 120,000 tons of ore being sent to the mill. <br /> Waste rock is either stored on site or blended with tailings and sold as construction material or <br /> road base, as was permitted in TR-09,which was approved on March 16, 2017. Of this amount, <br /> approximately 75,000 tons will be converted to fine mill tailings. Therefore, approximately <br /> 95,000 tons of waste rock and tailings will be placed in one of two TSFs while approximately <br /> 5,000 tons of concentrate will be shipped off site each year. The Revenue-Virginius Mine, for the <br /> purposes of this permit, has a mine life of approximately 8 years. This timeline is heavily <br /> dependent on grade, commodity markets, and exploration activities,which may reduce or extend <br /> this life. <br /> The ore consists of approximately I foot thick of quartz vein host rock and approximately 3.5 <br /> feet of wall rock which allows room for miners and equipment. The quartz veins have 4 principal <br /> minerals of interest: <br /> - galena (PbS) <br /> - sphalerite (ZnS) <br /> - chalcopyrite (CuFeS2) <br /> - Tetrahedrite (Cu12Sb4S13)with a variant freibergite which has some silver(Ag) <br /> replacing some of the copper. <br /> It is expected that these minerals will comprise approximately 20-40% of the vein material. The <br /> wall rock around the veins is primarily andesite,which is a very fine granite, consisting of <br /> quartz, feldspar, amphiboles,biotite and muscovite mica. The milling process is designed to <br /> concentrate the sulfide minerals; therefore,the tailings will consist primarily of quartz, feldspar, <br /> amphiboles,biotite and muscovite,which are inert minerals. <br /> Revenue Mine <br /> Amendment 02 D-3 <br /> Updated August 2022 <br />