Those who have had experience in gold digging have represented to us that miners have found great difficulties for the want of some process, by machinery or otherwise, in extracting the gold from ...
Only gold is extracted with no other ions or salts.” Gold is used in many industries including consumer electronics (mobile phones, laptops etc.) and, when the products are eventually discarded, ...
Special to The New York Times. TimesMachine is an exclusive benefit for home delivery and digital subscribers. Full text is unavailable for this digitized archive article. Subscribers may view the ...