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Hard rock mining is usually done on a large scale, and although a few small-scale hard rock operations still exist, it’s not an easy operation to start up and run profitably. The main problem for individuals or small groups interested in hard rock gold deposits is the high capital costs both for the mining equipment to dig and remove the rock as well as the equipment to crush and process hard rock ore in order to extract the gold from its solid rock enclosure. Because of this, many prospectors who look for hard rock gold seek instead to sell their finds to large companies that possess the resources to develop them. For more about the Geology of Gold Deposit formation check out my webpage

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hard rock mining gold and silver ore and processing it

In this day, it is a lot harder for the individual operator to get involved in hard rock mining. This type of metal mining is a lot tougher than it used to be for several reasons, including modern environmental and other restrictions and perhaps even more importantly, far fewer opportunities to sell or process your rock. There was a time 60 or 80 years ago, smelters would buy small lots of high-grade ores, and there were small custom mills across the west that would process the ores, paying the miner for the metals produced. At the present time, I know of no smelter that will accept small lots and there are very few custom mills still left and the equipment at some of them is questionable at best. The issue for a would-be hard rock metal miner then becomes what would you do with your ores? Small scale heap leaching is a possibility – it is a process that is worth considering.

Many prospectors would just like to know something about are hard rock prospecting and how to find gold veins as well as rich pocket deposits of high grade gold ore. Let's get started with the basic concepts behind hunting rich pockets of gold by tracing or as it's called in Australia, loaming

The first step in pocket hunting is to identify a gold bearing area that may have pockets – usually a smaller drainage in an area known to have produced coarse gold in the past. The goal is to find a drainage with a single gold source, or at least one dominant source that is contributing the majority of the gold - too many different sources contributing gold to the mix makes this method unworkable.  The best places to look for residuals are on flat to moderate slopes, with limited vegetation, where coarse gold is known to be present that drain only a small area. The larger the drainage area, the more likely that multiple gold sources are contributing to the placer, and this makes finding any single one of them much harder. A great example of the right type of place to look might be in smaller drainages above old placer diggings. Information pointing out these kinds of areas can often be found in old geologic reports.

hard rock mining gold and silver ore and processing it

The second step is to take samples along the drainage to determine the limits of the gold bearing area. In the past, this has been done by panning, but it is now possible to do much of the same work with a metal detector. Once the limits have been determined, the pocket hunter then takes some samples up the slope from the drainage to determine which side of the drainage the gold is coming from. If some gold is coming form both sides, the goal is to find one side that is the majority source and has much more gold than the other. If no significant difference is found in one side of the drainage or the other, it may well be that there are too many small sources contributing to easily identify any one source. If a single or dominant side of the drainage can be identified, the next step is to move up the slope of the hill taking samples to determine limits of the gold going up hill. Generally these are taken in a line parallel to the axis of the drainage being tested. Keeping in mind the typical triangular, fan shaped dispersion pattern for the gold, the prospector can trace the gold up slope. Good gold found within a few consecutive samples taken and panned, may indicate you are on the right track and within the downhill dispersion pattern of a residual gold pocket. Another line of sample is then taken further up hill to test the placer. The gold should become more abundant as the samples approach the residual placer “pocket” at the point of the triangle.  These methods have remained unchanged for centuries and were described as used by the California gold rush 49ers by Mark Twain in his book “Roughing It”.  A good example of where this type of technique might work is where you have found a good quantity of placer gold working up a small ravine and the gold suddenly drops off to nearly nothing. This is a strong indication that you should turn and look up the slope of the adjoining hillsides for the source – possibly a rich residual placer deposit

If you have a rich quartz vein or other hard rock deposit, you may be interested in the mining methods used to mine and break the rock. Its hard to believe, but thousands of miles of underground tunnels were drilled and blasted by the old time miners using nothing more than hand steel and hammers, to manually drill their blast holes. Modern mining techniques use compressed air to power a device called a jackleg for drilling. The jackleg is adjustable for the angle of the holes in the speed that it drills. In addition, water can be added to help hold down the dust. The holes are drilled in an organized pattern which defines the opening the miners trying to create.  Dynamite or other explosives such as ammonium nitrate, are added to the drill hole when the miner is ready to blast

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