Shares as security for a Mortgage?

Hi,
Can anyone help with a question I have in relation to seeking a First time mortgage to purchase a house using shares in a Plc company as security.
The shares are in a small exploration company and the cost was approx 150,000 euro.
Today they are worth around 45,000 euro.
I do not want to sell any of the shares as I have a realistic expectation that they will recover in a 3 – 4 year timeframe. (The company is well funded and has a solid investment in another company commencing production)
I am in my late thirties and am in a steady job with a salary of 37,000 euro and have savings of 20,000 euro.
I am happy to offer all of the shares as security against the mortgage.

Q. How would a bank look on this proposition?
Q. Would a bank significantly increase the amount I could borrow by using the shares as security?

Thanks in advance for any help.

No, the bank will ignore them.

Let me ask you a question.

If you owned a house worth €150k with a €130k mortgage, would you borrow €45,000 extra to invest in these shares?

Thanks for your replies.
I am inclined to agree but I do intend discussing the proposal with the banks.
I know from 7 years ago a manager in one of the non Irish banks took similar shares as security for a personal loan- only 12 thousand euro though.

I have no intention of selling the shares and will "happily" rent for another year to boost my deposit and see how house prices go.
Thanks again.

Banking practice 7 yrs ago is light years away from present policies!