I am very curious whether users who are putting fake locations in their profile will be expelled when reported?
Good examples would be users living somewhere in the world but put in a fake locations
in order to get attention from users in that area, just to lure them offline one or two messages later.
Is there a policy in place at Mingle?

Yes. We have a report system that is in place. You can find the link at the bottom of your e-mails or to the right of their pictures on their profiles.

I have reported one woman so far on the site over a week ago with several accounts pretending to be in Perth/Australia and Campaspe,Victoria but when they contacted me on WhatsApp their number were from Quebec/Canada.She/He even refuse to have a video call to confirm HER/HIS identity.These SCAMMERS should be blocked and banned for life within minutes of this site will get a bad reputation and people will move away from it.
I just found another one with two different accounts today.One was in Tasmania and the other was in Western Australia.

Whatsapp is outside Mingle's jurisdiction. Nothing can be done from the admins, when users go off site

I believe the site mingle2 should ask for an official ID like a passport or drivers licences with photo to confirm their identity.
I am on Facebook and I was ask for a photo ID to confirm my profile and I was very happy to oblige to the request as there are many people with fake identity pretending to be in Australia when they are in some African countries using fake pics on their profile.

I am on FB myself, I was never asked for any photo ID. And I have a picture of one of my cats set up as my profile picture

Honestly, I would never share any "official" ID online. But there is many ways to find out, if someone's identity is a fake or not.

Then why are there so many scammers getting away with it ?
clean them up before they give a bad reputation to the site and real customers living in droves.

There's a whole industry of scammers worldwide, on every social media and dating site. It will be impossible to eliminate all of them as new ones would keep appearing.