Ian J. MacEachern

Deceased - December 12, 1984
The MacEachern-Ponsford Memorial Award

B. Sc. Honours Thesis

The Distribution, Character and Composition of Gold in Till at the Fifteen Mile Stream Gold District Halifax County, Nova Scotia.

(PDF - 4.3 Mb)

In a study carried out at the Fifteen Mile Stream gold district, Halifax County, to document the distribution, character, and composition of gold in till around the former gold mines, 21 sample sets of A, B, and C horizon material were collected from the soil profile. Sampling was conducted at 10m intervals in till exposed by two trenches which are oriented perpendicular to the strike of both the veins and host strata.

Geochemical analyses for gold, silver, lead and arsenic were performed on samples of the B horizon and on 4 size fractions of the C horizon. Samples of the A horizon were analyzed for gold only.

The >2f fraction of the C horizon with a mean gold content of 217 ppb contains higher concentrations of gold than other size fractions and horizons analyzed.

The gold occurs as foliated flakes which are morphologically similar to gold particles from the tailings of the mine. That the gold is not far-travelled is evident from the lack of surface striations or other deformational features indicative of abrasive transport.

Microprobe analyses of gold from the till gave unexpected compositions which differed significantly from those of the presumed source. Gold from the till has an average composition of 69% copper, 10% gold, 9% zinc and 1% silver as compared with gold from the mine tailings which average 91% gold and 9% silver. This discrepancy in composition between the primary and secondary gold is thought to be due to a hydromorphic redistribution of gold in the till.

On the basis of correlation analysis performed on the geochemical results, and compositions determined using EMP analyses, gold, arsenic, copper, and zinc are considered the most important elements to be analyzed in pedogeochemical exploration for gold mineralization in rocks of the Meguma group.

Pages: 82
Supervisors:  Marcos Zentilli


Ian's Obituary

Ian J. MacEachern


Ian Joseph MacEachern, 24, 48 Geldhardt St., Halifax, formerly of Port Hawkesbury, died Wednesday in Hardwood Hills, Pictou County, as a result of a mining accident.

Born in Parrsboro, he was a son of Allan J. and Anna-Marie (Gillespie) MacEachern.

He was a geologist, owner and President of Tilex Consultants Inc. He was currently employed with the federal and provincial Mines and Energy Department.

He was a member of the Canadian Mining and Metallurgy Society, a former member of Parrsboro Citizens Band, a former assistant band master of Port Hawkesbury Marching Youth Band and a member of St. Joseph's Church, Port Hawkesbury.

He graduated in 1978 from Strait Area Education and Recrearion Centre and from Dalhousie University in 1983 with a B.Sc. and was studying for his masters.

Besides his parents, he is survived by two sisters, Andrea, Halifax and Sheilagh, Port Hawkesbury; two brothers, Gregory and Stephen, both of Port Hawkesbury; paternal grandfather, John D. MacEachern, Port Hawkesbury; maternal grandmother, Mrs Pearl Gillespie, Parrsboro.

The body is in Dennis Haverstock Funeral Home, Port Hawkesbury. Funeral will be 2 p.m. Sunday in St. Joseph's Church, Rev.Robert Day officiating, with burial in the parish cemetery.

Family flowers only. Donations may be made to Nova Scotia Kidney Foundation.