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• W2184120940 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. Stream drainages expose coal at the base on both sides of the escarpments at the basin edges. These coal outcroppings, along the eastern margin of the Anambra Basin, were first reported in the early 20 th century. Subsequently, they were mapped and drilled during the 1940's and 1950's by the Geologic Survey of Nigeria (GSN). Commercial mining at two locations near Enugu and two other locations along the northeastern margin of the Igala Plateau at Orukpa and Okaba were undertaken then. With an exception of limited production from the mine at Okaba, none of these mines is currently operating. Coal exposed in stream drainages at the base of the Enugu Escarpment on the eastern edge of the basin near the contact between the False Bedded Sandstones of overlying Mamu Formation and the underlying Enugu Shale was mined at Okpara and Onyeama mines. The primary source of data for this study is the exploration program and core drilling conducted by Western Goldfields Ltd. Other information include The Coal Resources of Nigeria, published by the GSN in 1963. New tools in the form of software provide better analysis of the coal's economic potential and this paper attempts to develop new geological models that can be used to improve mining plans, capital expenditures, production costs and identify potential problems or opportunities, with drillings and topographic mapping." @default.
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• W2184120940 date "2014-04-25" @default.
• W2184120940 modified "2023-09-27" @default.
• W2184120940 title "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" @default.
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