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ANNEX C-3 GEOLOGY AND GEOCHEMISTRY SUPPLEMENTAL INFORMATION
Annex C3 – Geology and Geochemistry Supplemental Information C3 - 1 DISCUSSION OF REGIONAL GEOLOGIC TERRAINS IN GHANA A primary feature of the geology of Ghana is the parallel alignment of narrow (15 to 40 kilometres (km) wide), somewhat evenly spaced, northeasterly trending belts of folded Birimian metavolcanic rocks (Figure 3-5). Between these belts are broad (approximately 60 to 90 km wide) sedimentary “basins” consisting predominantly of Birimian turbidity sedimentary rock sequences (Ghana Minerals Commission and WGM 1998; Ireland et al. 2001). Across southwestern Ghana, these belts can be divided geologically into four distinct terrains based on the major rock type or systems that outcrop (Figure 3-5). These systems include: 1. An early Proterozoic terrain (Birimian System) with older metavolcanics (intrusive dikes and lava flows) of basaltic and andesitic composition. These metavolcanic units exhibit pillow structures indicating subaqueous eruption of the original basaltic lava. These metavolcanics underly younger sedimentary sequences comprised of greywacke, turbidities, volcaniclastics, and argillites. Together these units form five sub-parallel belts of volcanic rock separated by broad “basins” of sedimentary rocks. Although difficult to determine because of folding and faulting, the total thickness of the Birimian in Ghana may be as much as 10,000 to 15,000 meters. The contact between the sediments and volcanics is poorly exposed (Ghana Minerals Commission and WGM 1998). The Birimian system hosts most of the country’s gold mineral deposits and outcrops over as much as one-third of the southwestern part of the country. 2. Tarkwaian System is a distinctive sequence of clastic sediments, which were deposited in sedimentary basins that form the core of many of the Birimian volcanic belts (i.e., 250 km long Ashanti Belt). 3. Voltaian Basin, in which are preserved the late Precambrian to Paleozoic sediments that mantle the craton. 4. Intrusive rocks (primarily granitoids) that have been emplaced in Birimian and Tarkwaian rocks, some of which (Belt-type) are intrusive equivalents of the Birimian Volcanics. The Birimian and Tarkwaian sequence exhibits a strong northeast-southwest oriented structural fabric that is a manifestation of both the axial planes of major tight isoclinal folds (anticlinal sedimentary basins and synclinal volcanic belts) and major fault systems. The rocks typically dip more than 60°. Regional fault systems often exhibit a complex history of thrusting, normal and strike slip motion. Metamorphism in the Birimian is “low-grade” greenschist facies except near intrusive contacts where amphibolite assemblages occur in the metasediments. Akyem Gold <strong>Mining</strong> Project November 2008 FINAL EIS
Page 1 and 2: A N N E X C SUPLEMENTAL INFORMATION
Page 3 and 4: Annex C1 - Flora and Fauna Species
Page 23 and 24: ANNEX C-2 AQUATIC RESOURCES SUPPLEM
Page 25 and 26: Annex C2 - Aquatic Resources Supple
Page 27: Annex C2 - Aquatic Resources Supple
Page 31 and 32: Annex C3 - Geology and Geochemistry
Page 35 and 36: Drill Hole ID Core Interval (meters
Page 41 and 42: TABLE C3-5 (continued) Lithology Ke
Page 45 and 46: TABLE C3-7 Results of Synthetic Pre
Page 47 and 48: TABLE C3-7 (continued) Results of S
Page 49 and 50: TABLE C3-8 Results of Biological Ac
Page 51 and 52: TABLE C3-8 (continued) Results of B
Page 53 and 54: TABLE C3-9 (continued) Results of P
Page 55 and 56: TABLE C3-9 (continued) Results of P
Page 57 and 58: Annex C4 - Water Resources Suppleme
Page 59 and 60: Flow (m3/sec) 80 70 60 50 40 30 20
Page 63 and 64: Flow (m3/sec) 80 70 60 50 40 30 20
Page 67 and 68: Surface Water Statistic Afosu Strea
Page 73 and 74: Piper Diagram for Pra River and Tri
Page 75 and 76: Seep Water Statistic All Seep Sampl
Page 77 and 78: Seep Water Statistic All Seep Sampl
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Seep Water Statistic All Seep Sampl
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Annex C4 - Water Resources Suppleme
Page 83 and 84:
Groundwater Elevation (meters re ms
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Groundwater Elevation (meters re ms
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Annex C4 - Water Resources Suppleme
Page 89 and 90:
Table C4-7 Groundwater Chemistry (2
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Surface Water Statistic Village Wel
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Surface Water Statistic Village Wel
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Groundwater Type Statistic Village
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Piper Diagram for Village Wells Aky
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Annex C5 - Soil Resources Supplemen
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Series BEKWAI NZIMA KOKOFU ODA TEMA
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Annex C6 -- Noise Supplemental Info
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Annex C6 -- Noise Supplemental Info
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ANNEX C-7 SOCIOECONOMICS SUPPLEMENT
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Annex C7 -- Socioeconomics Suppleme
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