By Capt. Paul & Dr. Nat in Texas (Eclogite) on Wednesday, September 21, 2005 - 07:56 pm:
Lol, we really do have geology groupies on here!!!
Sorry for not getting here sooner. I am actually in New Mexico doing some mine consulting work right now, about 800 miles from Houston and Dr. Nat. I will be leaving for Texas early tomorrow to get back before Rita comes a knockin'. We're about 80 miles from the Gulf, but if Rita hits as a Cat 5, we will feel it.
Alright, first off, the Iron Mountain Iron Mine tours are in Vulcan, about 2 miles east of Norway on US 2.
Mary: A drift is a tunnel that is driven from a shaft outward, but never reaches the surface, otherwise it would be an adit; an adit is what the Iron Mine and Quincy Mine tours enter in on. A stope is a mined out portion of an orebody, such as the HUGE room in the Iron Mine, or if you go on the Quincy tour, it is the big room that's angled upward after you cross the steel bridge over #5 shaft.
Margaret: Yes, most mines (and caves) stay at or very near a constant temperature year around. The Quincy on the 7th level stays at around 44 degrees. However, if you could travel down the shafts they got much hotter. At the 92nd level, Quincy was near 100 degrees and the Witwatersrand gold mines in South Africa are about 150 degrees uncooled.
Charles: The Menominee and Gogebic Ranges are pretty much the same geology wise. They are a hematite-magnetite/chert banded iron formation (BIF). The Marquette Range does differ in that it is mostly a hematite/jasper BIF which gives it its colorful banding. Age wise all three are about the same; around 2.1 billion years. The three BIF's are not related. The Menominee and Gogebic Ranges were at one time thought to be connected, but no evidence has ever been found to prove this. The Marquette Range is an entity all to itself. The only BIF related to it is the Mesabi Range in Minnesota.
Being underground is a lot of fun. I spent about 4 hrs today underground examining some old copper/lead/zinc mines in central New Mexico. For those of you who think you can't handle the underground world, I would strongly suggest going on the Quincy Mine tour in Hancock. The adit and levels are large, well lit, and quite dry. When I worked there, we had some tourists who said didn't like closed spaces. After the tour, they said they would recommend it to anyone. Plus, this is a great time of year to visit; not as many people AND the colors are outstanding while riding the tram downhill.
By Gina (Gina) on Wednesday, September 21, 2005 - 08:11 pm:
I live in Gwinn and work in Marquette. Took me two hours to get home Monday night. All of the Harvey traffic was re routed to the crossroads and back down 480.
By Gina (Gina) on Wednesday, September 21, 2005 - 08:15 pm:
sorry, meant to put my message in the what's up section!!
By Shawn Callahan (Shawncallahan) on Friday, September 23, 2005 - 09:34 am:
This was the highlight for my family in July of 2004. Best mine tour we took. We will be back. Absolutly love the UP.