Stratovolcano to Huge Hole in the Ground
A
cache
by TerryDad2 (adopted by Supertbone)
Hidden:
11/2/2006
Size:
 (Not chosen)
Difficulty: 
Terrain: 
(1 is easiest, 5 is hardest)
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The ~8.5 mile drive up Butterfield Canyon to the overlook is all on
a single lane road with the end on a rough unpaved road. It should
all still be drivable by a standard car, but nothing lowered.
Winter snows should make the road impassable. Alternative location
would be the Kennicott Visitor Center, see below.
 
I have been informed that the mine will be expanding
and the viewing area at the coordinates will be closed
sometime soon. I have permission from the mine to move the
Earthcache to the visitor center when the area is closed. I
will accept a visit to either location. See the waypoint
for the guard shack to enter the mine and get directions to
the current loction of visitor center. Their visitor center is
closed during certain times of the year, usually winter, so
call to be sure they are open. A donation is required.
The earthcache brings you to an overlook of the Bingham Canyon
Copper Mine. This is the largest open pit mine in North America and
the largest deposit of copper and gold on the continent. It
produces copper, molybdenum, gold, and silver.
The formation of this ore deposit began with the pulling apart
of the North American continent during the Eocene to form what is
known now as the Basin and Range Province. This time, fractures
developed in the continental crust throughout the region to
accommodate the stretching. At one of these fractures magma pushed
its way to the surface to form the Bingham stratovolcano at Bingham
Canyon. A stratovolcano is a volcano made up of alternating layers
of volcanic ash and lava. Mount Pinatubo is a modern day
example.
Between 38.8 to 39.8 million years ago (late Eocene) two large
stocks (reservoirs) of magma pushed their way through the
surrounding sedimentary rock to form what are now the Last Chance
and Bingham Stocks, two related igneous rock bodies.
At the end of the formation of these stocks, more magma intruded
through the Bingham Stock from 39.7 to 37.7 million years ago. This
intrusion created fractures for hydrothermal groundwater. Later the
magma cooled to form the Bingham Canyon porphyry. A porphyry is an
igneous rock that contains large crystals within a fine-grained
matrix.
 The copper and other metals contained in the
magmas were then dissolved in hydrothermal groundwater. Over
time, the groundwater moved through the fractures surrounding
the Bingham Canyon porphyry concentrating the metals around
it. As a result, the porphyry became the major ore body of the
canyon.
Image Source: Bingham stratovolcano Source:
Hattori, 2001
In the millions of years since, the Bingham stratovolcano has
been eroded away leaving only the core.
Like the Bingham stratovolcano, Mount Pinatubo has similar
deposits. Even though it is an active volcano, there are mines on
its sides producing copper from its porphyrys.
Note: This discussion is an extreme generalization. Additional
detail regarding additional geologic events, geologic chemistry,
and hydrologic chemistry can be found in the references.
Logging requirements:
Send me a note with :
- The text "GCZ5ZF Stratovolcano to Huge Hole in the Ground" on
the first line
- The number of people in your group.
- Describe the direction the mine is digging.
- Give me your explanation as to why they are digging in that
direction.
The above information was compiled from the
following sources:
- Briggs, David F. Bingham Canyon
- Sec. 25-27, 34-36 T.3S. R.3W. Mining Operations Report, Version
2004, Last Entry 6/23/2005
- Hattori, Keiko, Jeffrey D. Keith, 2001,
Contribution of mafic melt to porphyry copper mineralization:
evidence from Mount Pinatubo, Philippines, and Bingham Canyon,
Utah, USA, Mineralium Deposita( 2001) 36: 799-806
- USGS, America's Volcanic Past - Utah,
http://vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Places/volcanic_past_utah.html
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Logged Visits (
52 total. Visit the Gallery (15 images)
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Warning.
Spoilers may be included in the descriptions or links.
Cache find counts are based on the last time the page generated.
|
 October 23 by rosoccer (1981 found)
My seven year old daughter did not like riding close to the edges.
[view this log] | October 11 by Landsharkz (2208 found)
We visited the area today with Caverspencer's family. We spent a good deal of time reading, watching and learning about the mine and the uses for copper. I'll upload pics soon! TFT Great Earthcache - I think we have more earthcaches in Utah over the years we've been visiting than any other state or province. Utah Rocks!
[view this log] | October 11 by christcpd (198 found)
Went up there today. Didn't know this was an Earth Cache so here we are, four of us, turning over every rock, looking for a micro. GREAT spot. We had heard about it but didn't quite know what to expect. A little snow and ice on the road in just one spot. Lots of snow around though. Thanks for bringing us there. Will upload photos later.
[view this log]
| September 19 by xvegfamx (156 found)
Wow will upload photos when I get home
[view this log]
| September 7 by adbrimhall (188 found)
Visiting the outlook on Labor day. What a view!
[view this log] | |
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Current time: 11/22/2009 12:11:25 PM
Last Updated: 10/24/2009 2:54:00 AM
Rendered: From Database
Coordinates are in the WGS84 datum
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