Magnesium Depletion?

Seeing as though magnesium is one of the most abundant element upon land and in water, making up 13% of the Earth’s mass and mantle, magnesium is primarily extracted from seawater and magnesium-rich salt brines, and it therefore seems highly improbable that Australia’s natural magnesium reserves will deplete in the foreseeable future. Due to this fact alone, there is no specific nor estimated time in which Australia nor the world will find itself in a shortage of magnesium.  

However, an excessive and unnecessary amount of magnesium ore mining, extraction and exploitation will result in its deficiency in our soil, but not so within our waterways and systems. Magnesium found as ores through open-cut mining (ie. magnesite and dolomite) face possible exhaustion form Australia's natural reserves by the year 3024. This figure, however can be altered through society's utilisation of magnesium in its natural state. Using magnesium sourced from seawater and brines is the only secure manner of using and producing magnesium for the benefit of humanity. Therefore, in order to sustain our magnesium reserves, it would seem wise to only produce magnesium alloys and ores from dissolved magnesium in water, rather than mining for it.  Extracting magnesium from our waterways rather than soils will deter any chances of potential deletion and therefore allow society to continue in using magnesium as a metal and an alloy. 

Magnesium, in its dissolved state in seawater and brines, does not face any means of depletion, yet magnesium found as ores within the crust and mantle do. Magnesium ore depletion can deterred and/or avoided by not only sourcing magnesium from salt-water, but also recycling magnesium metal and its various aluminium alloys.