riffles

Après avoir changé 5 lignes des riffles, de 8 lignes au total, pour les tapis couverts par les cadres spécialement conçus, la récupération moyenne d'or a été augmentée par 62 %.
After changing last 5 rows for carpets covered by especially designed frames, out of 8 rows in total, the average gold recovery was increased by 62%.
Concentration de minéraux lourds, par exemple l'or ou la cassitérite, en lavant le matériau non consolidé dans des rampes de lavage inclinées (sluices) équipées de riffles qui permettent de piéger les minéraux plus lourds dans le fond de la rampe.
Concentrating heavy minerals, e.g., gold or cassiterite, by washing unconsolidated material through boxes (sluices) equipped with riffles that trap the heavier minerals on the floor of the box.
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