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Exploration of aggregates in Louisiana : final report.
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1991-05-01
[PDF-9.86 MB]
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Alternative Title:Exploration of aggregates in Louisiana.
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Abstract:Aggregate material deposits which can be processed economically for construction materials are an important resource for the state and the Louisiana Department of Transportation and Development (LADOTD). This need, together with the shortage of aggregates in the state, necessitated a thorough study in development of an exploration methodology for mapping the availability, location and extent of aggregate materials. This report describes a comprehensive exploration methodology which involves the integration of terrain analysis techniques, and geomorphological and geotechnical studies to locate aggregates in Louisiana. Landform analysis from aerial photographs along with geomorphic analysis to topographic forms has indicated the areas of promise which required futher in-situ investigations. Ground methods, employing both geotechnical and field sampling techniques, have aided stratigraphic analysis and refined the image based expectations. The techniques employed are explained in detail so that they can be readily put into practice. Specific sites were identified, one in each region of Louisiana, and are used as examples to demonstrate the principles of exploration from broad scale mapping to site-specific exploration. In summary, sand and gravel deposits are generally associated with modern river floodplains and valleyflanking Late Pleistocene terraces. In the coastal terraces of south Louisiana, gravel-bearing river trends also occur oblique to present river systems. Older gravel-bearing trends of modern and Late Pleistocene rivers are the most favorable for mining since cost-effective hydraulic mining techniques can be used. The older deposits provide suitable quantities of gravel by dry mining techniques when increased clay fractions and presence of iron oxides are not important considerations.
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