The Monitor

The Monitor (HM12D8)

Location: Angels Camp, CA 95222 Calaveras County
Buy California State flags at!
Country: United States of America
Buy United States of America flags at!

N 38° 4.576', W 120° 32.828'

  • 0 check ins
  • 0 favorites

California Hydraulic Mining

Hydraulic Mining
was the largest and most destructive form of mining. Water, brought through flumes and ditches from high up in the mountains, was redirected into an ever-narrowing channel and out through a giant iron nozzle, called a "monitor." This high pressure stream of water was used to wash entire hillsides through enormous sluices to recover the placer gold.

By the early 1880s, it is estimated that 11 million ounces of gold had been recovered by hydraulic mining in California. However, hydraulic mining had a devastating effect on the environment, causing pollution in rivers and streams. Due to the environmental issues and lawsuits put forth by farmers, it was essentially outlawed in California in 1884. This monitor is believed to date to the late 19th century.
HM NumberHM12D8
Placed ByAngels Camp Museum
Marker ConditionNo reports yet
Date Added Friday, October 24th, 2014 at 3:19pm PDT -07:00
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)10S E 715147 N 4217118
Decimal Degrees38.07626667, -120.54713333
Degrees and Decimal MinutesN 38° 4.576', W 120° 32.828'
Degrees, Minutes and Seconds38° 4' 34.56" N, 120° 32' 49.68" W
Driving DirectionsGoogle Maps
Area Code(s)209
Closest Postal AddressAt or near 667 S Main St, Angels Camp CA 95222, US
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. Is this marker part of a series?
  2. What historical period does the marker represent?
  3. What historical place does the marker represent?
  4. What type of marker is it?
  5. What class is the marker?
  6. What style is the marker?
  7. Does the marker have a number?
  8. What year was the marker erected?
  9. This marker needs at least one picture.
  10. Can this marker be seen from the road?
  11. Is the marker in the median?