All of these factors contribute to the unique hydrogeology of the Ozark Plateaus. Secondary mineralization has occurred in many of the rock units, and uplifting has resulted in fracturing and faulting of the rock units. Rock formations include igneous, metamorphic, and sedimentary rocks. The Ozark Plateaus Province is diverse in lithology, mineralogy, and structure. Approximately 595 mi of rivers, streams, and lakes are impaired as a result of mining activities within the Assessment area.Effects on aquatic resources from present-day mining activities are primarily associated with in-creased sedimentation of streams caused by instream gravel and sand extraction.Several abandoned, historical mine sites continue to contribute to chemical and metal leachates and runoff, increasing acidity in some cases and affecting aquatic resources within the Assessment area.The primary mining activity in the Assessment area is surface mining of common variety minerals that generally go to the building and road construction industries.In 1996, approximately 692 mining-related operations for hardrock and coal extraction occurred in the Assessment area. ![]() What are the current status and potential effects of activities associated with the exploration and extraction of minerals on aquatic resources within the Assessment area? General Technical Report SRS-33 Ozark-Ouachita Highlands Assessment: Minerals and Geology - Ozark-Ouachita Highlands Assessment Minerals and Geology
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