GMZ Field Report


By Jim Klein

Thank God for metal detector manufactures like White's Electronics. If were not for them, gold prospectors in California and other areas of the country soon will be almost out of ways to find gold. If you're not aware of it, the State of California recently passed a law banning dredging on any waterway in the state. A few years ago, they put so many restrictions on the two-cycle engines a lot of miners used on dry washers that a lot of gold prospectors almost gave up on mining. Now that you can no longer dredge for gold, you're wondering how you’re going to find those beautiful gold nuggets. I've got the answer. Gold mining with a metal detector. Now a lot of you may have looked into nugget shooting in the past and thought that the gold detectors were too expensive... well, they were. You also found that they were kind of complicated to operate...well... again, they were, all that has changed now with the new White's GMZ gold-finding metal detector.

Before I tell you about White's GMZ, I want to comment on all the things some groups as well as some government agencies are doing to take away our right to enjoy our hobby or avocation. Believe me folks, with their success in California they will be attacking gold prospecting all over our fine country, using the new laws in California as a club to beat us into the ground. Isn't it a shame that the state that had the biggest gold rush in world history and is founded on principles and laws that were set by gold miners is stabbing the men and women who are following in their footsteps in the back? You read Tom Massie's editorial in the last issue and so you can see how upset all of us here at the GPAA are about this. All is not lost though. I spoke with Pat Keene of Keene Engineering and he told me that PLP (Public Land for the People) has filed a lawsuit to overturn the new laws and, after reading their documents, it is clear that the bad guys stepped all over our constitution and were dishonest as well. Thanks to Jerry Hobbs of PLP and people like Pat Keene, I think we will see these kind of tricks no longer tolerated by the rest of the good Americans who just want to exercise their freedoms.

The people at White's are a good example of the good Americans I’m talking about. All their detectors are made right here in Sweet Home, Oregon, in the good old U.S.A. The company began in the early 1950's when the whole country was swept up in the hunt for uranium. I remember people running all over the mountains and deserts waving Geiger counters and guns as well, trying to be the first to find some rich uranium deposit. I know because I was one of them. So was Ken White Sr. I don't know if he was packing a gun like the rest of us. He sounds like that kind of person who had more sense than that. I didn’t shoot anyone but I did get shot at and shot back but no one got hit and it did make you reluctant to encroach in an area where someone else was prospecting. You could look around and see guys all over the place. They even went down in to the Grand Canyon and had to be chased out by park rangers as I recall. In 1950, the only Geiger counters available used headphones. White found out real quick that wearing headphones in rattlesnake country was not a good idea.

He invented a better Geiger counter but when he tried to convince manufactures to use his design they told him his Geiger counter was impossible to produce. He refused to believe that and decided he would make them himself. He and an employee started out making one Geiger counter a day in the basement of a furniture store. The unit was so well-liked by prospectors that the demand encouraged him to add more help. In seven years, he had 65 people working for him. The bubble burst in 1958 when the government announced that it would no longer buy uranium which meant that there was no more market for his Geiger counters. One of his dealers in Tombstone, Arizona said that he could really use a good metal detector. Never one to back down from a challenge White designed and built his first detector and sent it to the dealer to test. The first time out with White's detector, the dealer found an old Spanish spur as well as a large piece of sliver (Tombstone was built on silver mining) and coins and artifacts. It was 1959 and White's Metal Detectors went on to become one of the largest metal detector companies in the world. The hand-built White's detector is one of the finest made and most advanced available for the gold prospector and treasure hunter.

The GMZ is a perfect example of what White's detectors are all about. Right off the bat, I can tell you that it is the best deal that I have seen in a long, long time. The GMZ is a gold detector designed for the common man. If you have not gotten into gold prospecting or nugget shooting with a metal detector, the GMZ is your chance to get into it quickly and simply and at a price you can afford. It is a lightweight easily-operated gold detector that performs as well as any gold detector I've used no matter what the price or the operating options. One of the reasons is there are only three controls used to run the GMZ. In my mind, there are only two controls that you really have to work as the third is a toggle switch that you just flip to either the normal operating mode or the salt operating mode. One of the other controls is the sensitivity knob that is used to turn the GMZ on and off and adjust gain. The second knob is the ground reject control to adjust the amount of ground rejection needed for the area you are searching. Some of the specs for the GMZ are:

Weight3.35lbs including batteries
Operating Frequency48 kHz- 5 OkHz
Operating ModeAll Metal
Ground RejectionYes
Power8 AA (in battery Packs)
Battery Life47 Hours
ConstructionMetal except for coil

There are only four simple steps to take before you start hunting those gold nuggets or deposits of material to run through your sluice or dry washer. They are:

1. Install the battery pack and be sure the door is shut tight.
2. Set the toggle switch in the normal position.
3. Turn the ground reject knob fully counter clockwise to the lowest setting.
4. Turn the sensitivity/power knob on and set it to the factory suggested preset mark.

That's basically it. You make a few sweeps across the ground and if you get any clicking or chatter you adjust the ground reject control until you eliminate the clicks or chatter and start nugget shooting. We took the GMZ out of the box, snapped it together and we were hunting in minutes. I had put out a couple of small nuggets and a small gold bearing piece of quartz for a quick test and the GMZ found them without a problem. The target signal was clear and sharp and pinpointing was easy using the cross method of target location where you pass the coil over the target east, west, north and south and the gold is in the center of the cross. If you are prospecting in places that have a high alkaline content, like some desert areas, you can flip the toggle switch to the salt position which will eliminate a lot of the interference you can get in those regions especially if the ground is damp. We were able to increase the depth of the GMZ by adjusting the sensitivity control and were able to find small nuggets several inches deep. We tested the GMZ in several of our favorite gold prospecting areas and it worked like a charm everywhere we tested it.

I've saved the two things I think you are going to like the best for last. The first is that with the GMZ there is no threshold hum to worry about as it operates silently. The only sound you hear is a target. I'm getting old and it is nice not listening to that hum all day. Just having to listen for the sharp report of a target is great. Okay, now here is the big one- the price. It is only $499.99. I don't think I have ever seen a gold detector as good as the GMZ is in finding gold and as easy to operate that is close to that kind of deal. At this time, the only place you can get a GMZ is through a full-service local White's dealer. For more information contact:

White’s Metal Detectors
1-800-547-6911 or

For more information on the White's GMZ metal detector, please visit the GMZ product page.

I’ll see you there...
*Reprinted from the January/February 2010 issue of Gold Prospectors*