43-101 2008 Technical Report On The La Fortuna Project, Durango ...

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13.3 2005 CASTLE GOLD TEST HEAPS In 2005 Castle Gold initiated the construction and leaching of two test heaps on the Property using material mechanically excavated from two pits. The oxidized and weathered material from the two pits were found to be fragmented to a size possibly amenable to direct leaching; with the majority of fragments being less than 2 inches in size. Pit 1 (Plate 5) is located near the east side of the mineralized area and Pit 2 is located near the west side of the mineralized area. All ore used for the test heaps was supplied as runof-mine (“ROM”) material with no crushing in order to determine the feasibility of directly leaching material upon excavation. Heap 1 was constructed as a single 3 m lift containing 18,205 tonnes of low-grade material (averaging 0.25 g/t Au) from Pit 1. Leaching commenced at the end of August 2005 and was completed in October 2005. Heap 2 was constructed as a single 3 m lift containing 8,372 tonnes of high-grade material (averaging 1.78 g/t Au) from Pit 2. Leaching commenced in November 2005 and was completed in December 2005. The two leach pads and leached residue were observed and inspected during the 2006 Howe site visit. Plate 5. Test pit #1. Gold recovery from the resulting gold-cyanide solutions collected from the two heaps was performed offsite by Metals Research Corporation. Following the completion of the leach cycles, extensive sampling of the heap residues was completed by Castle Gold under the direction and supervision of Tucson, Arizonabased Metcon. The results of Metcon’s analysis of the samples are presented in Section 13.3.1. The leach results and observations for the two heaps from Koningen (2006) are summarized in Table 9. 34
Table 9. Castle Gold test heap leach results and observations. Heap 1 - Low Grade Ore The cyanide solution application rate was consistent at ~0.002 gpm/ft 2 . Leaching was performed for a period of 45 days. The decision to discontinue leaching was made based on the fact that the difference between the gold content in the barren and pregnant leach solutions at this time was extremely low (~0.03 ppm). The data indicates that the vast majority of leaching was completed in the first 25 days. Dissolved copper levels in the leach solutions were extremely low (
Page 1 and 2: TECHNICAL REPORT ON THE EL CASTILLO
Page 3 and 4: SUMMARY Introduction At the request
Page 5 and 6: Castillo Remaining Mineral Resource
Page 7 and 8: Undiluted Reserves at $550 per Ounc
Page 9 and 10: epresent an incremental increase in
Page 11 and 12: TABLE OF CONTENTS 1.0 INTRODUCTION
Page 13 and 14: Table 4. Driving distances from Dur
Page 15 and 16: Castle Gold has accepted that the q
Page 17 and 18: 2.0 PROPERTY DESCRIPTION, LOCATION,
Page 19 and 20: Figure 2. Map showing mining conces
Page 21 and 22: 2.1.2.3 Property Taxes The property
Page 23 and 24: Table 5. Maximum precipitation in a
Page 25 and 26: 3.0 HISTORY The El Castillo Project
Page 27 and 28: commonly reach elevations of 2,500
Page 29 and 30: Figure 4. Cross-section through the
Page 31 and 32: At El Castillo, the presence of cha
Page 33 and 34: Toward the center of the mineralize
Page 35 and 36: 7.0 EXPLORATION In 2006, Castle Gol
Page 37 and 38: 9.0 SAMPLING METHOD AND APPROACH Th
Page 39 and 40: 11.0 DATA VERIFICATION 11.1 INTRODU
Page 41 and 42: Morgain Minerals Inc. El Cairo Gold
Page 43: 13.0 MINERAL PROCESSING AND METALLU
Page 47 and 48: material is relatively consistent a
Page 49 and 50: Plate 6. View of the El Castillo si
Page 51 and 52: 14.2.1 Methods A shift of -500,000
Page 53 and 54: 14.2.4 Pit Optimization Parameters
Page 55 and 56: Undiluted Reserves at $600 per Ounc
Page 57 and 58: Table 13. Comparison of Howe 2003 a
Page 59 and 60: 15.2.2 Change of Land Use The Compa
Page 61 and 62: 16.2.1 Capital and Operating Cost E
Page 63 and 64: Table 15. Operating Cost Summary (U
Page 65 and 66: will be operating the mine indirect
Page 67: Table 17. Sensitivity Analysis - Gr
Page 70 and 71: 16.2.2 Economic Evaluation The Base
Page 72 and 73: Table 23. US$ - Mexican Peso Exchan
Page 74 and 75: • Castle Gold should complete geo
Page 76 and 77: Panteleyev, A., 1996, Epithermal Au
Page 78 and 79: 9. To the best of my knowledge, inf
Page 80 and 81: CERTIFICATE OF AUTHOR dated July 31
Page 82 and 83: Appendix A Pit Optimization Level P

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