The best frequency for a gold detector depends on the size and depth of the gold, the ground conditions, and the type of detector you are using. Metal detectors operate in a range of frequencies, and each frequency has its advantages and limitations for detecting gold. Here's a breakdown:

1. Higher Frequencies (30 kHz - 100 kHz)

• Best for small gold nuggets: High-frequency metal detectors are more sensitive to small pieces of gold. They can detect smaller targets with greater accuracy.
• Shallow detection: High frequencies are generally better for detecting objects that are shallow or near the surface.
• More affected by mineralization: Higher frequency detectors tend to be more sensitive to ground mineralization, which can make it harder to use in highly mineralized areas unless the detector has ground balancing features.
• Popular frequencies for gold detectors: 40 kHz, 50 kHz, or even higher.

2. Lower Frequencies (1 kHz - 20 kHz)

• Better for deep gold targets: Lower-frequency detectors can penetrate deeper into the ground, which is useful for finding larger gold nuggets at greater depths.
• Less sensitive to small gold nuggets: These frequencies may miss smaller targets or struggle to detect fine gold.
• More stable in mineralized ground: Lower frequencies are less affected by ground mineralization, making them more stable in areas with lots of iron or hot rocks.
• Common frequencies for general-purpose gold detecting: Around 5 kHz to 15 kHz.

3. Mid-Range Frequencies (20 kHz - 30 kHz)

• Balanced performance: Mid-range frequencies offer a balance between depth and sensitivity. They can detect both small and medium-sized nuggets without sacrificing too much depth.
• Good for moderate ground conditions: These frequencies are a compromise between handling mineralization and maintaining target detection ability.
• Example: Detectors operating around 25 kHz are often considered a good balance for gold prospecting in various conditions.

Multi-Frequency Detectors

• Some modern detectors use multi-frequency technology, where they operate on multiple frequencies simultaneously. This allows the detector to handle a wide range of targets (small and large gold) and cope with various ground conditions.
• Best of both worlds: Multi-frequency detectors are more versatile and can perform well in both shallow and deep scenarios, though they are often more expensive.

Recommended Frequency Range for Gold Detection

• Small Gold Nuggets: 30 kHz to 50 kHz
• Medium to Large Nuggets at Greater Depths: 10 kHz to 25 kHz
• General Purpose/All-around Gold Detecting: 15 kHz to 30 kHz

Conclusion
For prospecting gold, the ideal frequency largely depends on whether you are searching for small, shallow gold or larger, deeper nuggets. If you’re specifically targeting small gold nuggets, go for higher frequencies around 40-50 kHz. For larger, deeper gold targets, a frequency in the range of 10-20 kHz would be more effective. If your budget allows, a multi-frequency detector can offer the best versatility.