You are standing in front of the world's largest glacial float
copper. It was discovered in 1997 on private property in the
Keweenaw Peninsula north of Hancock, Michigan.
Does copper float?
No, not in the traditional sense of the term. However,
"float" is a geological term used to describe any material
that has been carried by erosion away from it's original spot of
formation, such as by glaciation.
The Keweenaw Peninsula had ancient lava flows produced during
the Mesoproterozoic Era as part of the Midcontinent Rift. The
volcanic activity here produced the only place on Earth where 97
percent pure native copper can be found.
Native copper in the Keweeenaw is found in two forms:
Float Copper which is formed as a solid mass that has
been carried away from it's original source by glaciers.
Lacy Copper which is formed from copper filling cavities
on lava flow surfaces, thus giving it a lacy consistency.
TO LOG THIS CACHE
Email me the answers to the following questions.
1) How much does the float copper weigh? (Look at the sign
nearby. Do not look it up online, the online answer is incorrect,
that was the estimated weight.)
2)Where was this piece of copper found originally and how did it
get there?
3)Estimate how thick the float copper is.
4)OPTIONAL upload a picture of your GPS in front of the float
copper without the sign showing.
If you do not email your answers to me, your online log will be
deleted. If you are caching in a group, every cacher logging this
must complete all of the tasks. No group emails(one cacher emailing
for the group.) No exceptions. Sources: Wikipedia- copper
Wikipedia- Keweenaw Peninsula The Mining Journal News Articles-
largest float copper