Gold jewellery is seen in a melting pot at the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017.

A worker places gold jewellery into a melting furnace at the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017. Image for illustrative purposes.

A worker holds a gold bar made from melted jewellery at the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017.

A worker holds a pot with liquid gold at the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017.

A worker holds a shovel with gold jewellery for melting at the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017.

An employee sorts gold bars in the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017. Image used for illustrative purposes.

Gold jewellery is pictured at the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017.

A gold bar made from melted jewellery is seen at the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017.

Image used for illustrative purpose. Gold bars are seen in the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017.

A worker holds a shovel with gold jewellery for melting at the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017.

Image used for illustrative purpose. A worker pours liquid gold into a mould at the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017.

Gold jewellery is pictured at the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017.

A worker pours liquid gold into a mould at the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017.

A worker holds a gold bar made from melted jewellery at the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017.

A worker holds a shovel with gold jewellery for melting at the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017.

Image used for illustrative purpose. A worker holds a gold bar made from melted jewellery at the Austrian Gold and Silver Separating Plant 'Oegussa' in Vienna, Austria, December 15, 2017.