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33 General introduction.   33 Haydite raw material (black shale) in the Kings River and Button areas of the Matanuska Valley, Alaska, by Richard A. Eckhart 35 Introduction...  35 Location of area 35 Previous investigation 35 Present investigation 37 Geography___ __ __  37 Geology 38 Matanuska formation 38 Kings River area 40 Button area 43 Surficial deposits.. 45 Factors affecting development 45 Properties of lightweight aggregate.-.  45 Bloating tests 46 Discussion of bloating 49 Properties desired of haydite raw material  52 Other economic factors  53 Reserves, 54 Mining claims 55 Other potential sources of haydite raw materials 55 Conclusions 56 Haydite raw material (bloating argillite) near Lawing, Alaska, by George Plafker 57 Introduction 57 Geology-  57 General description 57 Lawing argillite deposit-- 58 Bloating characteristics 60 Reserves  63 References cited-.,_-__-____--__---_-_--___63 Index 65

Haydite raw material in the Kings River, Sutton, and Lawing areas, Alaska