e which is closed not far from the Sunlight Goldmine in Montana, the rain water mixing with Modern mines collect veins of materials, which have been trapped over millions of years in the sediment. Once out in the open they can get into the ground water and move down hill with the normal erosion patterns and water flows. This is because the minerals have been buried for centuries underneath in layers from previous periods. In the old Berkeley Pit, a copper mine which is closed not far from the Sunlight Goldmine in Montana, the rain water mixing with the sediment. Once out in the open they can get into the ground water and move down hill with the normal erosion patterns and water flows. This is because the minerals have been buried for centuries underneath in layers from previous periods. In the old Berkeley Pit, a copper mine which is closed not far from the Sunlight Goldmine in Montana, the rain water mixing with the normal erosion patterns and water flows. This is because the minerals have been buried for centuries underneath in layers from previous periods. In the old Berkeley Pit, a copper mine which is closed not far from the Sunlight Goldmine in Montana, the rain water mixing with r centuries underneath in layers from previous periods. In the old Berkeley Pit, a copper mine which is closed not far from the Sunlight Goldmine in Montana, the rain water mixing with e which is closed not far from the Sunlight Goldmine in Montana, the rain water mixing with the minerals left in the bottom of the Pit was quite toxic and contained arsenic, which is harmful in large amounts to humans and animals. Although arsenic is a poison, it is part of the natural occurring minerals in nature and common to that area. Small traces are not to bad, but once they become to high it is cause for alarm.

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