From quarts rocks ...to sand...the hard way

Just a idea if the MD-20 talks most on just one part of the rock you may want to brake off just that part of the rock to crush first. Maybe use a gold type of detector / larger coil over the rest of the original rock to scan a little deeper. There may only be flakes of values in just the parts of the rock that the MD-20 talked to you about or there could be values through out all of the rock. Be sure to re-use the MD-20 every time the rock gets smaller to find new values within the MD-20 range.
 

If this is a rea=sponse to my pic thank you for any help I can get
 

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