A world map shows nitrate mining locations marked by orange circles with "N." Key areas include the U S, Mexico, Chile, and Spain. Major clusters are in the U S (western states), Mexico, and northern Chile's Atacama Desert.
Nitrate Mines | Class | Rank | Percent | High Pressure | very high (>300) | high (100–300) | medium (20–100) | low (2–20) | very low (<2) | high (100–300) | medium (20–100) | low–very low (<20) | very high–high (>100) | medium–very low (<100) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2.3636363636363638 | 1 | 6.63% | 17.7% | 9.02% | 11.0% | 16.0% | 11.5% | 10.1% | 12.7% | 26.5% | 24.8% | ||||
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