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aJ�* <br /> foster <br /> wheeler <br /> Zephyr Gold USA Ltd. PAGE 12 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 /> FILTERED TAILINGS PL ACEMENT AREAS COMPAC TION REQUIREMENTS <br /> Max. Loose Lift Minimum Compacted <br /> Thickness Density <br /> (in) (ASTM D698) <br /> Shell Placement Area (Zone 1) 12 95% Max. Dry Density <br /> General Placement Area (Zone 2) 12 90% Max. Dry Density <br /> Filtered Tailings material shall be compacted, graded and sealed to promote runoff of precipitation off the <br /> filtered tailings storage facility (FTSF) or to the designated contact water ditches. <br /> 4.5.3 ROCKFILL <br /> The following placement procedures apply to Rockfill as classified by the criteria in Article 3.2. <br /> CONTRACTOR shall condition, place, and compact Rockfill by a method compaction technique with <br /> placement in controlled engineered lifts and compaction effort applied by construction traffic or by drum- <br /> drive smooth-drum vibratory compactors. The specifics of the method specification, including the lift <br /> thickness, will be dependent on test fill(s) constructed by the CONTRACTOR and on the available <br /> construction equipment. The test fill(s)shall be conducted in general accordance with the U.S.Army Corps <br /> of Engineers EM 1110-2-2301. <br /> It is recommended that the minimum size of compaction equipment consist of a minimum 10 tonne (static <br /> drum weight) vibratory smooth-drum compactor. The number of passes and loose lift thickness shall be <br /> subject to the size of compaction equipment used and to the approval of the ENGINEER. <br /> 4.5.4 STRUCTURAL FILL <br /> The following placement procedures apply to Structural Fill material as classified by the criteria in Article <br /> 3.3: <br /> • The moisture content of Structural Fill shall be distributed uniformly throughout each layer of <br /> material prior to and during compaction. <br /> • Materials too dry for compaction shall be pre-wetted in the stockpile or borrow areas. Materials too <br /> wet for compaction shall be dried to the proper moisture content before compaction. <br /> • Spread materials in horizontal layers not exceeding 12 inches in loose thickness. <br /> S:\ZEPHYR MINERALS\DRMS MINE APPLICATION\02200-EARTHWORKS.DOCX <br />