By jbuck (Jbuck) on Sunday, October 21, 2018 - 09:53 pm:
Thanks D. A. (Midwested)!
Here is the article i was remembering:
Alumnus Teams with Tech to Reclaim Stamp Sand and
Grow an Industry
August 16, 2010/Michigan Tech News
By John Gagnon
Despite the economic downturn, the roofing
industry in America is enjoying long-term,
fruitful prospects, and Michigan Technological
University will play a role in this nearly $9-
billion annual market.
One imminent initiative: a local plant that may
employ up to 40 people to process and supply sand
to the roofing industry.
A long-term plan: a local plant that would employ
300 people to manufacture roofing shingles.
Both initiatives would use the Keweenaw’s stamp
sand, a barren and unsightly leftover of copper
mining in the region. If aesthetically
unattractive, it is a financial beauty—expansive,
ready-made for the purpose and cost-effective.
These deposits are seen as the potential bedrock
of an economic boon.
Roof shingles are 30 percent asphalt and 70
percent rock granules, which are used as both
filler in the shingle and granules on its surface.
Currently, shingle manufacturers have to mine the
rock, crush it and add copper to retard the growth
of moss, lichen, fungus and algae—persistent
problems for homeowners. Upper Michigan’s stamp
sand has already been mined and crushed, and it
contains copper naturally.
By Uncle Chuck (Unclechuck) on Sunday, October 21, 2018 - 10:37 pm:
FJL & D.A., Thanks for the education and the clarification. I was always told as a kid, that we were not to swim in Torch Lake or eat the fish.
I certainly agree with preserving history, that being said... I believe that the dredge deserves a more fitting resting place with description in front of it explaining the purpose it served, more like a mining monument.