Check the listing for details. Rich Hydrothermal Gold Ore From Summit County Colorado!. Condition: Used. Listed at 700.00 USD. Rich Hydrothermal Gold Ore From Summit County Colorado! Here's a nice specimen of high grade Gold, Silver ore from Summit County Colorado! The white quartz is excellent for displaying the internally dispersed precious metals. The hydrothermal activity that occurred millions of years ago found themselves depositing within weaknesses in the quartz. The altered granite from heat served as what is known as the contact layer. This piece nicely displays how gold and other metals found themselves in serious paying values for the old timers thanks to long ago volcanic activity. Additionally rare gold tellurides of Calaverite and Sylvanite exist in this beautiful specimen. Specimen weight: 232.5 gramsDimensionsL = 3" W = 1.5" at the top then widening to 2.5" at base 1" Thick A portion of all sales go to charity. Support US miners! NO international shipping, email for more information.