My name is Jason Gaber with Mount Baker Mining and Metals, and today we’re going to demonstrate
a 12x9 hammer mill, run with a diesel motor. We have 286 pounds of ore here, it’s gone
through the jaw crusher. It’s about ¾ inch minus. And we’re going to time how long
it takes to run 286 pounds of material through the hammer mill.
Here’s some of the material we’re going to be testing that hammer mill with today.
We broke some open so you can see there’s some granite, some basalt, some metamorphics,
all very hard stuff. It’s all been river-rounded, so it’s very hard to break and crush.
We ran our material, and here’s what it came out looking like. Here’s the inside
of the hammer mill. The hammers have hardly any wear on them. They rounded the corners
a little bit, but other than that not much. There’s the bar grades with the millimeter
spacing. And we screened some of the discharge, here’s our 12 mesh plus, this is our 12-30
mesh, here’s our 30-50 mesh, and this is our 50 mesh minus.
These are the results from our 12x9 hammer mill test, with one millimeter bar spacing.
There’s our discharge size, we screened it out, those are the totals and percentage.
We ran 286 pounds in 14 minutes and 20 seconds, so that’s right about 1,200 pounds per hour.