... develop estimates for minerals, and it then presents estimates for oil, gas, coal, metals, and other minerals using these methods An appendix provides information on data sources and methods ... estimates of coal for –; tables .–. present estimates of metals for –; and tables .–. present estimates of other minerals for – Conceptual and Methodological Issues In addressing ... for oil and gas production is calculated as price times quantity produced Reserve estimates are from and for crude oil and dry gas The reserve volumes for oil and gas were augmented for...