Totally agree @btown! In fact, producers with a smaller margin,...

Totally agree @btown!
In fact, producers with a smaller margin, like EAR, will increase their SP more because any increase in the price of gold has a far greater effect on their profit. For example, if gold increases from say A$1800 per ounce to say A$2200 per ounce ie a A$400/ounce increase in price will increase the profit of a producer making say A$1000 gross profit per ounce by A$400 or 40%. A producer that makes a profit of say A$400/Oz will have their profit doubled under the same scenario. For Producers like EAR it will have a much bigger effect on their SP than for producers like EVN as an example.