Hydrologic investigations concerning lead mining issues in southeastern Missouri

69 Introduction 69 Study Area Description 71 Purpose and Scope 71 Methodology 71 Sample Sites 71 Sample Collection 72 Sample Analyses 72 Sediment-Quality Guidelines 73 Heavy Mineral Concentrate 73 Data Analysis 73 Distribution of Mining-Related Trace Metals 73 Sulfide Mineral Occurrence 76 Summary and Conclusions 76 References 78 Tables 81