Ernest Henry Mining: Magnetite ProcessingThe EHM orebody is an iron oxide copper gold (IOCG) deposit with magnetite being the form of iron ore. EHM's Ore Reserve Estimate at 30 June. 2010 is 88 million tonnes at a grade of. 1% copper, 0.5 grams per tonne gold and. 23% magnetite. In 2010, EHM produced 74,595 tonnes of copper in concentrate and 91,259.iron processing from magnetite sand,Magnetic Behavior of Natural Magnetite (Fe3O4 . - AIP Publishingshown by XRF results, the results indicate that the iron sand is dominated by magnetite up to 85.80 %. The XRD test showed that . Keywords: Iron sand, mechanical alloying, magnetic properties, magnetite . cutting edge is the production of Fe3O4 nanoparticle-scale natural for the application of ferroelectric materials . A.