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In 1987 a regional lake sediment and water survey was carried out in the Goudreau Lake area, northern Ontario.  To avoid the possibility of fallout from Wawa sintering plant influencing the results, the lake sediment geochemical data was obtained from sediment which was laid down over 100 years ago, in "pre-Ambrosia" time.  Some of these samples were found to have positive geochemical results needed verification prior to the publication of the regional lake sediment survey.

To verify these results, long cores of lake sediments were collected in the Goudreau Lake area in March 1988.

The data are published in Ontario Geological Survey Miscellaneous Paper MP141 (a summary of field work and other activities for 1988).

The Ontario Geological Survey began as the Ontario Bureau of Mines in 1891, with a mandate to aid in promoting Ontario's mining interests. Through key collaborations and advancing geoscience data collection techniques, the organization evolved into a globally renowned survey that is now at the forefront of geological research.

Since its establishment, the Ontario Geological Survey has contributed significantly to fostering investment in Ontario, protecting public health and safety, informing environmental and land-use planning decisions, and helping the province become Canada's top mineral jurisdiction.

[from: https://news.ontario.ca/en/release/36088/celebrating-125-years-of-the-ontario-geological-survey ; accessed August 3, 2021]