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aJ�* <br /> foster <br /> wheeler <br /> Zephyr Gold USA Ltd. PAGE 8 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 /> 3.6 EROSION PROTECTION LAYER <br /> The Erosion Protection Layer shall consist of non-mineralized (non-PAG) sand and rock and will be used <br /> progressively placed on the downstream slope of the FTSF for erosion protection. It is anticipated that the <br /> material will be sourced from fine, non-mineralized mine waste rock, on-site quarries or imported. The <br /> CONTRACTOR will be responsible for loading, and transporting, placing the Erosion Protection Layer <br /> material. The Erosion Protection Layer material shall meet the following specification: <br /> Sieve Size Percent Passing <br /> 6-inch 100 <br /> 3-inch 70- 100 <br /> 1.5 inch 50—90 <br /> 3/4-inch 40—80 <br /> No. 4 (4.75 mm) 30- 50 <br /> No. 200 (0.075 mm) 0— 10 <br /> 3.7 RIPRAP <br /> Riprap will be used for erosion protection for diversion channels and contact water ditches. Riprap shall be <br /> composed of dense, angular, reasonably well-graded,sound fragments resistant to abrasion. Material shall <br /> be free of cracks, seams, clay, organic material and other defects that would hasten degradation by water <br /> and/or frost action. Rounded boulders or cobbles shall not be accepted as Riprap unless otherwise <br /> approved by the ENGINEER. Riprap material may be sourced from suitable non-mineralized waste rock, <br /> on-site quarries or imported from off-site. The CONTRACTOR will be responsible for manufacturing, <br /> loading, transporting, placing, and processing Riprap material. <br /> Material for Riprap shall meet the following properties: <br /> • The D50 size for the Riprap material will be as shown on the DRAWINGS. <br /> • Riprap shall be clean material, and shall not contain more than 5 percent fines (material passing <br /> the No. 200 sieve) by weight. <br /> Riprap shall conform to the size types as follows: <br /> S:\ZEPHYR MINERALS\DRMS MINE APPLICATION\02200-EARTHWORKS.DOCX <br />