Geological Map of the Nickel Lake Macrodike and Northern Bald Eagle Intrusion: Lake County, Northeastern Minnesota

Abstract

This map is the result of seven days of field mapping by the authors in 2007, as well as a compilation of information gathered from Green, Phinney and Weiblen (1966) and Peterson et. al (2006). This map was created by PRC Field Camp students under the supervision and guidance of Dr. Dean Peterson, NRRI Senior Research Associate, as the first map of the Precambrian Research Center’s Summer Field Camp. The purpose of this map is to aid understanding the nature of the Nickel Lake Macrodike and its pertinence to Cu-Ni-PGE mineralization in the South Kawishiwi Intrusion [SKI]. Additionally, this map will extend the range of Dr. Peterson’s ongoing project to map in the northern half of the SKI. Access to the 641 outcrops mapped for this project was provided by extensive canoe shoreline mapping and traverses in the bush of the Superior National Forest. Initial mapping of the Gabbro Lake and Bald Eagle Lake area was done on a 1:5,000 or 1:10,000 scale and reduced for this map to 1:10,000. Previous mapping of the Gabbro Lake area was done at a scale of 1:31,680 (Green et. al, 1966) and was limited shoreline traverses. The field work performed for this map was the first detailed mapping of the area.