The Pend Oreille Mapsifter is a specialized riffle box designed to separate fine gold from heavy concentrates in placer mining operations. It excels at capturing micron-sized gold that standard classifiers miss, making it a favorite among prospectors using highbankers and sluice setups.
Engineered in the Pacific Northwest, this map capture system emphasizes durability, precise flow control, and easy maintenance. Understanding its build, setup, and best practices helps you integrate it smoothly into a high yield recovery workflow.
| Model | Matting Type | Feed Rate Range | Typical Recovery |
|---|---|---|---|
| Pend Oreille 12 | 20 and 40 mesh | Light to Medium | 85% to 92% fine gold |
| Pend Oreille 14 | 30 and 50 mesh | Medium to Heavy | 88% to 94% fine gold |
| Pend Oreille 16R | Riffle + synthetic mat | High volume | Up to 96% fine gold |
How the Pend Oreille Mapsifter Captures Fine Gold
By combining riffles with a specialized mat, the pendulum action of material across the box slows dense particles, allowing them to settle into the mat fibers. The consistent slope and narrow flow path reduce turbulence, giving small gold ample contact time with the surface.
Adjusting the angle and introducing a steady, thin feed stream prevents channeling and ensures the mat can trap particles down to 30 to 50 mesh. This is especially valuable on ores where gold is encapsulated or attached to heavy black sands.
Setup and Integration with Highbanker and Sluice
Mount the Pend Oreille Mapsifter on a solid stand or between the discharge of a highbanker and the primary sluice. Use a controlled feed, such as a driveline or feeder tray, to maintain a thin, even layer across the entire width.
Maintain consistent water flow and check for mat clogs regularly. Pairing the map with a 20 to 50 mesh screen upfront optimizes capture while keeping the system efficient during extended prospecting days.
Maintenance and Longevity Practices
After each run, rinse the mat and riffles thoroughly to remove clays and residual gold. Inspect the seams and stitching for wear, especially around the riffle zones, and replace any compromised components before the next outing.
Storing the frame dry and protecting the mat from UV exposure extends service life. Keeping a spare mat on hand minimizes downtime in the field and ensures your recovery system stays at peak efficiency.
Performance on Different Pay Streaks
- Highbanker on bench gravels: captures micron gold that drops through 10 to 20 mesh
- Creek or bench sluicing: handles moderate flow while retaining fine particles
- Deep sands and lower benches: excels at stripping trace fines from black sand concentrates
- Dry washing with modifications: effective when used with a pre concentrate stage
Optimizing Your Recovery Workflow
Strategic integration, regular maintenance, and attention to feed control maximize the advantage of the Pend Oreille Mapsifter in demanding prospecting environments.
- Use a thin, evenly distributed feed to avoid channeling and mat overload
- Monitor flow speed and adjust the stand angle for optimal riffle performance
- Inspect and clean the mat after each run to preserve recovery rates
- Keep a spare mat and riffle parts in the field kit for quick replacement
- Combine with a 20 to 50 mesh classifier upstream for best pre concentrate separation
FAQ
Reader questions
How fine of gold does the Pend Oreille Mapsifter typically capture?
It reliably captures gold down to 30 to 50 mesh, with optimal performance when paired with a 20 to 50 mesh screen and a thin, even feed.
Can I use it with any highbanker or does it need a specific model?
Yes, it is designed to clamp onto standard 2 or 3 inch sluice frames and works with most highbanker discharge setups, provided you maintain a steady, thin flow.
What maintenance does the mat require after field use?
Rinse thoroughly to remove clays and black sand, check for mat seam and stitching wear, and store it dry and away from direct UV exposure.
How does it compare to a standard 50 mesh classifier for fine gold recovery?
While a 50 mesh classifier screens material, the Pend Oreille Mapsifter actively captures micron gold that flows through, resulting in higher recovery from the same concentrate.