Four suspects robbed Gold One just after midnight on Wednesday morning.
Six security gaurds were in the security office when four suspects, armed with firearms, burst into the office and held the gaurds at gunpoint.
The guards were then assaulted and tied together with cable ties while the suspects demanded keys to the melting house.
After the suspects found that the keys were not held on site, they fled the scene.
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It is alleged there were 16 suspects in total, all wearing balaclavas and speaking Sotho and Pedi.
The suspects gained entry to the property by cutting the outside security fence.
No shot were fired during the robbery.
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