Weighing the recycled silver using a really old-school weighing scale.
Old silver that needs to be melted down and then refined to pure (99.9%) silver. The block that you see in the corner's actually blackened sterling silver that's melted into a rectangle. It needs to be refined into tiny balls before it's ready to be used.
It's not completely visible from this picture but there's a vent that allows for proper ventilation of fumes so that the refiner doesn't inhale them.