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Mallets Creek Marsh, Lake Champlain: A plant-nutrient study
John T. Turk
1978, Open-File Report 78-462
Nitrogen and phosphorus dissolved in the interstitial water of Mallets Creek Marsh sediments supply about 42 percent of the nitrogen and about 9 percent of the phosphorus used by rooted macrophytes within the marsh. These percentages may become larger during middle and late summer, when water inflow to the marsh...
Ore controls at the Mahd adh Dhahab gold mine, Kingdom of Saudi Arabia
Ronald G. Worl
1978, Open-File Report 78-778
Mahd adh Dhahab is the largest of numerous ancient gold mines scattered through the Precambrian shield of Saudi Arabia and the only one with recent production. Free gold and silver, tellurides, pyrite, galena, sphalerite, and chalcopyrite are in and associated with quartz veins and quartz veinlet stockworks. Country rocks consist...