Jim,
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I have a bit of experience. Once you bring that OBJ in to Element 3D, you will drop those textures on to your diffuse and specular channels options that you will see in E3D. When you click on the OBJ itself up top, you will see some options below and when you click on the surface, you will see other options.
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It will be some trial an error but with the 6 or so, you should be able to figure it out.
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Try the obvious first. Like I see one titled "diff" which I would guess goes on the diffuse channel.
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If you have a picture of the finished coin from where you bought it, thru some trial you should get it.
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I'm not the total expert but I've done this a few times.
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Eric