Fisher Gold Bug II 71 kHz Metal Detector for Gold Prospecting

The Fisher Gold Bug II is a 71 kHz VLF metal detector built for gold prospecting in mineralized ground where lower-frequency detectors miss sub-grain targets. Designed for prospectors working hot soil, ironstone, and gold-bearing country, the Gold Bug II combines dual-control manual ground balance with iron discrimination to reject hot rocks while maintaining sensitivity to fine gold. We've run this detector in Arizona caliche and Nevada desert washes, and the high-frequency operation detects nuggets that lower-frequency detectors pass over entirely. The 10-inch elliptical coil and hip-mountable control housing keep weight off your wrist during all-day prospecting sessions in remote terrain.

What's included

• 10-inch elliptical search coil
• Hip-mountable control housing

71 kHz High-Frequency Sensitivity to Sub-Grain Gold in Mineralized Soil

Gold-Bearing Country

The Gold Bug II's 71 kHz operating frequency makes it one of the most effective tools for detecting small gold nuggets that lower-frequency detectors pass over. In gold fields with heavy mineralization, the dual-control ground balance lets you null out ground response while the iron discrimination mode rejects hot rocks without sacrificing sensitivity to gold. The deep target audio boost amplifies faint signals from targets at depth, so you hear sub-grain pieces others miss. We've prospected with Fisher metal detectors in gold country from the Bradshaws to the Mojave, and the Gold Bug II detects fine gold that lower-frequency detectors miss. High-frequency operation prioritizes sensitivity to small targets, the right tradeoff when you're chasing flour gold and picker-sized nuggets in decomposed granite or ironstone.

Desert Washes & Dry Placers

Lightweight construction and hip-mountable design reduce wrist fatigue during long prospecting sessions in remote terrain. The 10-inch elliptical coil covers ground efficiently while maintaining maneuverability around boulders and bedrock crevices. Precision ground balance control handles variable soil conditions as you move from decomposed granite to ironstone without constant retuning. The elliptical coil maintains maneuverability around boulders and bedrock crevices where gold settles. When you're hiking miles into dry washes with no vehicle access, the Gold Bug II's lightweight build matters, you can swing it all day without the arm fatigue that ends a hunt early.

Ironstone & Hot Rock Fields

Iron discrimination mode separates ferrous hot rocks from non-ferrous targets, a critical feature in volcanic soils where false signals from magnetite can overwhelm a detector. The dual-control ground balance gives you independent adjustment of mineralization response, so you can fine-tune rejection of ground noise while preserving target response in challenging soil. Hot rocks are the prospector's constant obstacle in ironstone country, and the Gold Bug II's discrimination lets you ignore them without losing the faint whisper of a sub-grain nugget six inches down. The dual controls give you more tuning range than single-knob systems, essential when soil composition changes every few feet.

Dual-Control Ground Balance & Iron Discrimination for Variable Mineralization

• Extreme sensitivity to sub-grain gold: high-frequency operation detects nuggets other detectors miss in the same ground.
• Dual-control ground balance for variable mineralization: independent adjustment handles soil changes without losing target sensitivity.
• Iron discrimination rejects hot rocks: separate ferrous targets from gold in volcanic soils and ironstone country, so you're not chasing magnetite all day.
• Deep target audio boost for faint signals: amplifies weak responses from small or deep targets so you hear what's there, critical when a sub-grain nugget at depth produces a signal barely above threshold!
• Hip-mountable and lightweight: hip-mountable control housing reduces arm fatigue during all-day prospecting sessions in remote locations!

Fisher Gold Bug II vs. Fisher Gold Bug Pro

Prospectors cross-shopping the best gold metal detectors often compare the Gold Bug II to the Fisher Gold Bug Pro, a lower-frequency alternative with different tradeoff characteristics. If you're working ground that's been heavily detected and the big nuggets are gone, the Gold Bug II finds what's left. Both detectors use manual ground balance, the Gold Bug II's dual-control system gives finer adjustment in variable soil. The Gold Bug II focuses on iron discrimination and deep target audio boost. We stock both, and the choice comes down to target size and soil conditions, high-frequency for fine gold in hot ground, lower frequency for larger targets and easier soil.

Ground Balance Setup for Mineralized Soil

The Gold Bug II's dual-control ground balance is the feature that lets it operate in soil where single-control detectors lose target response. The dual-control ground balance handles mineralization while iron discrimination separates ferrous from non-ferrous. Start by setting discrimination to minimum, then adjust ground balance until the ground noise disappears. Increase sensitivity until you hear a faint threshold hum, then fine-tune ground balance to eliminate any remaining ground chatter. Once ground is balanced, bring discrimination up to reject hot rocks, but keep it low enough that you don't lose small gold. The deep target audio boost amplifies faint signals, use it when you're working bedrock or deep washes. In highly variable soil, you'll rebalance every few feet, the dual controls make that fast. Prospectors new to manual ground balance sometimes struggle with the two-knob system, but once you learn it, you can tune the Gold Bug II to soil conditions that automatic detectors can't handle. We walk customers through ground balance setup for their specific region, Arizona caliche requires different settings than Nevada decomposed granite or California ironstone.

71 kHz VLF Technology for Fine Gold Detection

Understanding metal detector technologies helps explain why the Gold Bug II excels at fine gold. At 71 kHz, the Gold Bug II operates at a high frequency optimized for small gold detection. Sub-grain gold produces a tiny eddy current, and high-frequency transmission couples more efficiently with small conductors. For prospectors working tailings, old diggings, or heavily detected ground, that's the right tradeoff. High-frequency operation helps reduce ground noise in mineralized soil. The dual-control ground balance compensates for what remains.

Elliptical Coil Design for Bedrock Crevices & Tight Spots

The 10-inch elliptical coil shape is optimized for the terrain where gold settles. The elliptical coil maintains maneuverability around boulders and bedrock crevices. Gold accumulates in bedrock pockets and along fracture lines, spots where you need precise coil placement. The elliptical footprint also reduces ground coverage per swing, which sounds like a disadvantage until you're working a patch and need to isolate a faint signal from surrounding ground noise. Narrower coil width means less soil in the detection field, easier ground balance in variable mineralization. The 10-inch length gives you reasonable ground coverage on open washes, the elliptical shape gives you access to the spots where gold hides. The stock 10-inch elliptical is the all-around choice for prospecting.

Hip-Mountable Control Housing for All-Day Prospecting

Weight distribution matters when you're swinging a detector for six or eight hours in remote terrain. The Gold Bug II's hip-mountable control housing takes the electronics off the shaft and puts them on your belt, so you're only swinging the coil and lower shaft. That reduces wrist and forearm fatigue, the limiting factor on long prospecting sessions. The coil cable routes cleanly from the hip mount to the shaft, no cable whip or snag points. You can tweak settings without stopping your swing or taking the detector off. Prospectors who've used shaft-mounted detectors all day know the arm burn, the Gold Bug II eliminates it. The lightweight coil and lower shaft assembly, combined with hip mounting, let you cover more ground before fatigue forces a break.

Iron Discrimination Mode for Hot Rock Rejection

Hot rocks, ferrous mineralization nodules that produce false signals, are the bane of prospecting in volcanic soils and ironstone country. Iron discrimination mode separates ferrous targets from non-ferrous, so you can ignore hot rocks and focus on gold. Discrimination is a tradeoff, aggressive settings can mask small gold, conservative settings leave you chasing hot rocks. The Gold Bug II's dual-control system lets you balance that tradeoff, ground balance handles mineralization, discrimination handles ferrous rejection. Set discrimination just high enough to ignore the hot rocks in your area, but low enough to hear sub-grain gold. In practice, that means testing your settings on known targets, a small nugget and a local hot rock, and adjusting until the nugget signals and the hot rock doesn't. When you're working a patch with heavy hot rock contamination, iron discrimination is the difference between a productive day and constant false signals.

Deep Target Audio Boost for Faint Signals at Depth

The deep target audio boost feature amplifies weak signals from small or deep targets, bringing faint responses above the threshold hum so you can hear them. Sub-grain gold at depth produces a signal that's barely distinguishable from background noise, the audio boost amplifies those faint signals. When you're working deep washes or bedrock with overburden, the audio boost lets you hear targets you'd otherwise miss. The tradeoff is that it also amplifies any remaining ground noise, so ground balance has to be tight before you engage the boost. In clean ground, the audio boost is a free sensitivity increase. In hot ground, it's a tool you use selectively, turn it on when you get a faint signal and want to confirm it's a target, then turn it off to reduce noise. Prospectors working bedrock crevices or deep gravel use the audio boost constantly, it's the difference between hearing a picker at six inches and walking past it.

Specifications

• Operating Frequency: 71 kHz
• Coil: 10-inch elliptical search coil
• Ground Balance: Dual-control manual
• Discrimination: Iron discrimination mode
• Audio: Deep target audio boost
• Weight: Lightweight, hip-mountable design
• Recommended Use: Gold nugget hunting in mineralized ground

Why Buy from Serious Detecting

We're an authorized Fisher dealer, so your Gold Bug II ships with full manufacturer warranty and our team's field support. We've prospected with metal detectors in gold country from the Bradshaws to the Mojave, and we stock the coils and accessories that pair with this detector. Free shipping, 30-day returns, and price-match guarantee apply. The Gold Bug II sits at the top of the gold prospecting category for extreme sensitivity to fine gold, and our team can walk you through ground balance setup for your specific soil conditions.