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aJ�* <br /> foster <br /> wheeler <br /> Zephyr Gold USA Ltd. PAGE 6 OF 15 <br /> Dawson Gold Project SEC. NO.: <br /> Dawson Filtered Tailings Storage Facility SPECIFICATION 02200.0 <br /> Pre-feasibility Study <br /> TECHNICAL SPECIFICATIONS FOR DATE: (ORIGINAL) <br /> Fremont County, Colorado EARTHWORKS 20-October-16 <br /> PROJECT NO.: 74201633 REVISION: A <br /> DATE: 20-Oct-16 <br /> A synthetic tailings sample generated from exploration core of the Windy Gulch deposit during the Pre- <br /> feasibility Study were found to be non-plastic and contain approximately 60% passing the#200 sieve by <br /> weight. <br /> 3.2 ROCKFILL <br /> Rockfill shall consist of inorganic, non-mineralized (non-PAG) rock and will be used in the construction of <br /> the starter buttresses. It is anticipated that the rockfill will be sourced from non-mineralized mine waste <br /> rock, on-site quarries or imported. The CONTRACTOR will be responsible for loading, and transporting, <br /> placing and compacting Rockfill material. Rockfill shall meet the following specification: <br /> Sieve Size Percent Passing <br /> 12-inch 100 <br /> No. 4 (4.75 mm) 0—30 <br /> No. 200 (0.075 mm) 0— 15 <br /> Non-plastic fines <br /> Rockfill material shall have a maximum particle size of 12-inches or sixty-seven(67) percent of the approved <br /> lift height, whichever is smaller, unless otherwise approved by ENGINEER. Rockfill material shall be inert, <br /> hard and durable with a minimum uniaxial compressive strength of 40 MPa and no more than 45% loss <br /> during the Los Angeles Abrasion test <br /> 3.3 STRUCTURAL FILL <br /> Structural Fill shall consist of inorganic structural earthfill used in the construction of the contact water pond <br /> berms and other ancillary fills as required. It is anticipated that native alluvial/colluvial soils at the project <br /> site may be used for structural fill. The CONTRACTOR will be responsible for excavating, sorting suitable <br /> from unsuitable materials, and loading, and transporting, placing, moisture conditioning and compacting <br /> Structural Fill material. Structural Fill shall meet the following specification: <br /> Sieve Size Percent Passing <br /> 3-inches 100 <br /> No. 4 (4.75 mm) 30—80 <br /> No. 200 (0.075 mm) 0—30 <br /> S:\ZEPHYR MINERALS\DRMS MINE APPLICATION\02200-EARTHWORKS.DOCX <br />