do the numbers stack up?, page-7

Dratoz

you can buy any listed share using your margin loan. The approved investments list is what they accept as collateral.

So Ricee007 say has $5,000 in Mac Bank shares in his loan account. He can borrow up to $3,500 on a 75% LVR. You can use this to buy $3,500 AAM, I have done this. However, the AAM shares cant be used as collateral so $3,500 is all you can borrow.
If you went and bought RIO instead of AAM then you could also borrow up to the LVR of RIO so you could borrow more.

Its the way it works on commsec anyway. Trust this explains it and you can get on board the AAM express train.