Coal Resource Evaluation And Models: A Case Study From Parts Of Okobo And Enjema In Kogi State Within The Lower Coal Measures Of Mamu Formation, Nigeria
Mamah Luke, Nwafor, C. Gideon, Omada, J, I, Akpa Fabian, Okogbue Cele
Index Terms: Keywords: Coal resources exploration, geologic models
Abstract: In the wake of search for alternative energy resources amidst increasing oil prices, coal exploration with new technology and software interpretation cannot be underestimated. Subsurface delineation and evaluation of Okobo-Enjema coal resources within the Upper Coal Measures of Mamu Formation at Okobo Coal Field Nigeria was undertaken in this study. Topographic data obtained with global positioning system (GPRS) and processed with Minex 6.05 software showed top soil thickness gradient dependence. Areas with steep slopes of less than 12 degrees were found to have top soil thickness of 0.5m whereas areas of 12 – 30 degrees slope had top soil thickness of 0.25m. Overburden or Waste above Coal seam has same conformity as the top soil but shows gradients that mimic past Mamu Sea and fluvial system drainage. Topography also enhanced geologic mapping as topographic gradient differentiated lithotypes which corroborated core logs. Coal spatial attributes and geometry derived from geologic models formed the input to Gemcom Minex software for reserve estimation. The resource evaluation estimated a total of 51m of waste thickness and in situ Coal as 20.5 Tonnes with a strip ratio of 18.1.
. Australian Guidelines for Estimating and Reporting of Inventory Coal, Coal Resources and Coal Reserves. 2003 Edition. The Coalfield Geology Council of New South Wales and Queensland Mining Council. http://www.resources.nsw.gov.au/__data/assets/pdf_file/0015/35025/ (20/02/2014)
. Behre. Dolbear, 2006. Feasibility Study of Nigerian Coal Resources Development. Ministry of Solid Minerals Development, Federal Republic of Nigeria. http://www.globalmethane.org/documents/toolsres_coal_overview_ch24.pdf (19/02/2014)
. De Swart, A. J. and Casey, O.P., 1963. The Coal Resources of Nigeria. Geological Survey of Nigeria Bulletin. N0. 28. 100pp.
. Jenen, M. L. and Bateman, A.M, 1982. Economic Mineral Deposits. 3rd Edition, Revised Printing John Wiley and Sons. Inc.