TOPOGRAPHICAL AND GEOLOGICAL SURVEY OF OYO/IWAH MARBLE DEPOSIT IN LOKOJA LGA, KOGI STATE, NIGERIA

Detail topographic survey and geological traversing/mapping were carried out on the Oyo/Iwah marble deposit, Lokoja Local Government Area, Kogi State. The area is located in Basement Complex terrains of the South Western pan of Nigeria. 1:2000 scale topographical map and geological map of the project area were produced. The topographi- .. cal survey established the spot-heights and topographical features, while geological survey delineated and identifiedy different rock types and their respective boundaries including measurement of appropriate structure features, strike dip foliation. The area of study covers an area of 4km by 2km. The marble appears to have a roughly NE-SW trend, and thins to the South - West. The marble exposure covers an area of 2.5Km2, about 63 % of the surface area, followed by quartzite with an area of 1.20Km2 about 3%. Mica schist has a surface area of .12Km2 about 3%, while Lateritc covers about .lOKm2 of the surface, that is about 2.5% and pegmatite .08 Km2, which is about 2% of the first half of the block. The second half of the block is predominantly covered with mica-schist, quartzite, and pegmatite. The topographic study revealed the highest and lowest spot-height to be 375m and 275m above the sea level respectively. The drainage pattern of the study area is dendritic in nature, mainly drained by rivers Mimi, Opc, and their tributaries.