Just done a demolition site in historic area near my office this week, and going back! The building was in river bank historic district in site of where we made several hundred on bottles and dug musket balls and tokens. i found clads galore in the top soil they brought to make a new sidewalk in front and plant trees, continuing a river walk area. one 43 quarter was cool with me, was told its 90% silver. I know theres more. brass hose nozzle, old heavy one, horse shoes, unknown junk coming out. I trade off the good brass to a knife maker and have several good usable blades, and he is going to forge me a digging tool from some re bar. always look for a way to make a buck, old wood, metal from old tracks,makes mini anvils, old bricks with various makers stamped, cobble stones, old drain covers may be bras, makes garden decors, broken ceramic for table tops mosaic style. it pays for the hobby. lead goes to a guy who casts bullets. pull tabs to charity at Ronald McDonald house, nothing wasted! If its real old look for privies and trash pits. they contain old bottles and buttons. watch for wells, can be dangerous or generous on yields. made good money on shallow ones. found several with detector picking up big iron, and finding glass frags and bottles retrieving signal. make a probe out of an old trunk rod from a car. there are two under the trunk lid on old cars, put a hole in one side of a 6 inch long one inch diameter pipe and braise the rod in, round the other end off, and you have a probe. test the dirt, and if has been dug and filled over the last hundred or so years, the probe goes in, wiggle and scratch, you will hits bricks or glass, will learn by sound, then the digging gets good if its a pit or well. detect the throw out dirt also. the old pros taught me this a few years ago, they have gone their ways, most of the sites dug, but there are some left with renovations downtown for me! where ever man goes, he leaves something! think out of the box, while playing with the box! happy hunting!