The San Pedro River Valley

The San Pedro River Valley (HM2F0M)

Location:
Buy flags at Flagstore.com!

N 32° 24.021', W 110° 41.386'

  • 0 likes
  • 0 check ins
  • 0 favorites
  • 57 views
Inscription

On a clear day you can see the Gila National Forest in New Mexico from here!

You are looking at the San Pedro River Valley. The San Pedro River flows north to the Gila River, which ultimately meets the Colorado River and heads south to Mexico and the Gulf of California. The river supports riparian vegetation that provides wildlife habitat and recreation opportunities.
Six million years ago there was no San Pedro River and this basin had no outlet, so a large lake formed. Evaporation of the lake's salty waters resulted in a concentration of minerals such as gypsum, which is now mined to make sheetrock for the building industry.
The Galiuro Mountains, visible on the other side of the San Pedro valley, consist almost entirely of volcanic rocks that were produced by large volcanic eruptions between 20 and 30 million years ago. This was a period of great geologic unrest in southern Arizona, and the rocks that formed the Santa Catalina Mountains were uplifted from great depths at this time. The large copper deposits mined below in the valley are about 67 million years old and are related to intrusions of molten rock (magma).
Copper SmelterIn the valley below you can see the San Manuel copper smelter and tailings ponds.
Most of the copper produced by mining is used for electric wires in buildings and vehicles. A typical automobile, like the one you might have driven up



the mountain, contains about fifty pounds of copper.
This smelter uses technology designed to minimize impacts on the environment. It recovers 99% of the sulfur produced by smelting, and thereby helps keep the air clean.
The large rock you see behind you is called Barnum Rock, named after Willis E. Barnum, who became a Boy Scout leader in Tucson in 1916. During the early 1920s it was customary for honor scouts at Camp Lawton to be stationed on top of Barnum Rock to help the Forest Service as fire lookouts.
Funding for this sign was provided by the Tucson Section, Society for Mining, Metallurgy, and Exploration; Arizona Geological Society; and the Mining Foundation of the Southwest.
Details
HM NumberHM2F0M
Tags
Marker ConditionNo reports yet
Date Added Tuesday, March 19th, 2019 at 2:01pm PDT -07:00
Pictures
Sorry, but we don't have a picture of this historical marker yet. If you have a picture, please share it with us. It's simple to do. 1) Become a member. 2) Adopt this historical marker listing. 3) Upload the picture.
Locationbig map
UTM (WGS84 Datum)12S E 529175 N 3584855
Decimal Degrees32.40035000, -110.68976667
Degrees and Decimal MinutesN 32° 24.021', W 110° 41.386'
Degrees, Minutes and Seconds32° 24' 1.26" N, 110° 41' 23.16" W
Driving DirectionsGoogle Maps
Which side of the road?Marker is on the right when traveling North
Closest Postal AddressAt or near , ,
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

Is this marker missing? Are the coordinates wrong? Do you have additional information that you would like to share with us? If so, check in.

Check Ins  check in   |    all

Have you seen this marker? If so, check in and tell us about it.

Comments 0 comments

Maintenance Issues
  1. What country is the marker located in?
  2. Is this marker part of a series?
  3. What historical period does the marker represent?
  4. What historical place does the marker represent?
  5. What type of marker is it?
  6. What class is the marker?
  7. What style is the marker?
  8. Does the marker have a number?
  9. What year was the marker erected?
  10. Who or what organization placed the marker?
  11. This marker needs at least one picture.
  12. Can this marker be seen from the road?
  13. Is the marker in the median?