Even after the run TOX has had i'm thinking about buying a small...

Even after the run TOX has had i'm thinking about buying a small parcel.
But after reading through various broker reports, ASX announcements and financial statements, i still feel a bit light-on for information on one particular issue.
So, would someone more informed than myself be able to answer the question of what TOX's revenue structures are like? IE:
- Are they reliant on a few large contracts/customers, or do they derive revenue fairly equally from numerous contracts?
- Is revenue 'lumpy', i.e. subject to significant change quarter-to-quarter, or is there a relatively smooth flow of revenues?
- And although obviously Port Hedland generates more $ than Kwinana (at the moment anyway), are there distinguishing features in the revenue streams between the two sites that an investor should know about?

To anyone who spares the time to help me out, your help is very much appreciated.
Cheers.