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Using Geology to Find Gold

Gold in Limonite

FAULTS, CONTACT ZONES, INTRUSIONS

Introduction

• The video begins with an overview of geological methods to locate gold.

• The speaker explains the importance of understanding geology to save time by identifying areas unlikely to contain gold.

Geological Concepts Discussed

1. Aztec Sandstone

• Unsuitable for gold mining.

• Hosts other minerals like lead and silver through replacement deposits but minimal gold.

2. Role of Dolomite and Contact Zones

• Dolomite and limestone may host valuable minerals in contact zones.

• Specific geological processes, like metasomatism, transfer gold from granite into these zones.

3. Geological Maps

• Use maps and overlays of known mines to identify promising zones.

• Patterns in fault and thrust zones indicate potential gold deposits.

Key Techniques for Finding Gold

• Intrusion-Related Deposits:

• Gold deposits form where granitic intrusions meet limestone or dolomite.

• These areas are often enriched with crystalline gold.

• Secondary Enrichment Zones:

• Limonite deposits near contact zones can contain high concentrations of gold.

• Old mining techniques focused on extracting gold-rich limonite seams.

Examples of Successful Prospecting

• Historical mines, such as Keystone, Chita, and Oro Migo, highlight the significance of geological understanding.

• Specific features like green talc layers and limonite seams indicate rich deposits.

Tools and Techniques for Modern Prospectors

• Dry Washers: Efficient for sampling and processing material in arid regions.

• Panning Techniques: Essential for fine gold recovery.

Practical Tips

• Study USGS reports to pinpoint promising areas.

• Focus on contact zones and fault zones for higher gold potential.

• Look for visible indicators like red-stained limonite and green talc.