Unearthing Zinc Pennies: Mastering Metal Detection Techniques
Detecting Zinc Pennies with a Metal Detector
Introduction:
Metal detecting is an exciting hobby that allows enthusiasts to explore the hidden treasures buried beneath the ground. From ancient relics to modern coins, metal detectors have helped uncover a wide range of valuable items. However, not all finds are created equal. Amongst the plethora of discoveries, one particular challenge faced by metal detectorists is distinguishing between copper and zinc pennies.
Background:
Before 1982, pennies in circulation were made primarily of copper, while those minted after this year are composed mainly of zinc with a thin copper coating. The difference in composition can pose challenges for metal detectorists as these two types of pennies exhibit varying conductivity levels when scanned.
Understanding Conductivity:
Conductivity refers to how easily electric current travels through a material. In terms of metal detecting, it determines how well signals pass through different metals, allowing users to distinguish between various targets underground.
Copper has excellent electrical conductivity due to its low resistance properties. As such, it produces strong and consistent signals when detected by a metal detector. On the other hand, zinc has poor electrical conductivity compared to copper. This means that when using a standard metal detector setting for detecting copper coins or relics, zinc pennies may produce weaker or even undetectable signals due to their lower conductivity.
Adjusting Your Metal Detector Settings:
To detect zinc pennies effectively while using a standard coin hunting mode on your metal detector, you may need to make some adjustments tailored specifically for this purpose.
1. Sensitivity: Start by adjusting the sensitivity settings on your machine slightly higher than usual without causing excessive interference or false signals from mineralized soil or nearby objects.
2. Discrimination: Next, set your discrimination level lower than normal so that smaller targets like zinc pennies are not filtered out completely.
3. Frequency Shift: If your device offers frequency shift capability (VLF detectors), try shifting the frequency slightly higher or lower to see if it enhances your ability to detect zinc pennies.
4. Ground Balance: Make sure your metal detector is properly ground balanced to eliminate false signals from mineralization in the soil, which could interfere with detecting smaller targets like zinc pennies.
Tips for Detecting Zinc Pennies:
In addition to adjusting your metal detector settings, there are a few other tips that can help improve your chances of finding zinc pennies during your metal detecting adventures.
1. Research and Location: Do some research on areas where newer coins might be more prevalent. Places such as parks, playgrounds, parking lots, and modern construction sites tend to have a higher likelihood of yielding zinc pennies due to their increased circulation and recent human activity.
2. Digging Techniques: When you receive a signal indicating a potential target, use careful digging techniques such as making small plugs or using handheld pinpointers to avoid damaging the coin while recovering it.
3. Sorting Method: Consider carrying two separate containers – one for copper coins and another for zinc pennies – so you can easily differentiate between them while out in the field.
Conclusion:
Detecting zinc pennies with a metal detector requires understanding the differences in conductivity between copper and zinc metals. By adjusting sensitivity, discrimination levels, frequency shifts (if available), and proper ground balancing techniques on your metal detector, you can increase your chances of finding these elusive modern coins. Remember that research plays an essential role in determining high-probability locations for finding newer coins. With practice and patience, identifying and collecting both copper and zinc pennies will become second nature during your treasure hunts!