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I also agree with the over-optimization ... the nav structure seems a bit heavy right at the top.

I went to MozCon last year and a speaker presented info on just this sort of thing.... what to do when your niche category is relatively lame.  You might look at last year's presentations for some ideas.

This is a real opportunity!  Depending on your client reception to these ideas, you might want to take a look at a few things.  Decide on a social media tone that's appropriate and sales-worthy.

• Set them up as a leader in their field - authoritative tone and feel
• Offer up interesting material - who says it has to be business as usual?  As Ben mentioned about the pirates and creative posting - what if you inject some humor?  Laundry fails?  Cartoons/Comics?  Funny videos?
• Copper mining equipment ... sorry to say, that's pretty dry.  Wouldn't their potential contacts love some awesome humor interspersed with some helpful content.

Here's another perspective .... think about a big player like Pepsi.  Check out this video:

http://www.youtube.com/watch?v=yiP70pBUjuw&feature=related

Granted, big video, big budget ... but they were offering something memorable that really had little to do with drinking the product.

With a little creative thinking, that might be just the ticket for scoring decent returns in a tough category.

You could try an A/B test.  On some pages, place the form below your #container div and absolute position the contact form back up to the top with CSS.  After that, monitor for a bit and see if it helps.  Perhaps it's the making of a future YOUmoz blog post?

Check out Screaming Frog ... good stuff

I ran into this situation a few years ago.  We set up inner pages with the modal content anyway and loaded the content via ajax.  For users without javascript it would gracefully degrade.  Who doesn't have javascript right? Well, Google crawlers for one.  The additional pages won't hurt you.  You can craft this so it's a transparent process for the end-user.

If you're in a competitive market and you only have the single page it will be extremely difficult to compete with other sites that are pushing new content and consistently expanding their web presence.