longevity of phosphate boom, page-2

some facts
Phosphate rock is a general term that refers to rock with high concentration of phosphate minerals, most commonly of the apatite group. It is the major resource mined to produce phosphate fertilisers for the agriculture sector. Phosphorous is also used in animal feed supplements, food preservatives, anti-corrosion agents, cosmetics, fungicides, ceramics, water treatment and metallurgy.
I dont see all this slowing up
Australia’s commercial resources of phosphate are in north-west Queensland
It is easy to mine
Open pit mining is performed by large excavating machines, which strip the "overburden" (nonproductive overlay) and removed it from the site. A typical operation involves washing the mined phosphate with a hydraulic jet and then pumping it in liquefied "slurry" form to a washing plant. The phosphate is then mechanically graded by size, concentrated, and dried.

World phosphate production is dropping and demand is rapidly rising(American GEO survey)