I mistakenly tried posting pictures but was unable because I had the page set to HTML instead of Editor.
I will post some pictures now with a repeat of the text.
Discovery is located in a very ancient belt of rock called the Precambrian Shield. There was once (three to eight hundred million years ago) a gigantic range of mountains possibly rivaling the Himalayas, in that time erosion has worn them down to nearly a level plain with small hills and valleys. For up to two hundred thousand years the area was covered in glaciers up to ten thousand feet thick. When these retreated nearly 50,000 years ago nearly all the dirt had been scraped and eroded away leaving bare rock and swamp/muskeg. Water pools in every hollow and lakes abound. I think there are more lakes in the Precambrian Shield than the rest of the world combined.
The rocks in the area are called sediments because at one time, they were clay particles which were deposited in an ancient sea some two to four hundred million years ago. There were two to three miles deposited and then came a period of intense volcanic activity combined with earthquakes. The clay beds turned into limestone and were twisted and heaved. In the case of Discovery they were turned on edge 90 degrees from horizontal. The limestone was turned into a hard grey rock called Argillite by heat and pressure. The rock was shattered in places and molten rock was forced in from below. It was a white to grey rock called quartz and contains gold. This took place multiple times and gold was found in commercial quantity.
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Yes! Much better with pictures.
If you are using pictures off the net make sure they are not copyrighted.
I always search for pictures using bing.com and at the right you can select filters.
I use Free to use and share" or "Public Domain"
Hope this helps!
....upvoted and resteemed.