What is the contact resistance of a brass/copper for electrical Plug?

I'm a student from Newcastle University from Singapore Institute of Technology (A new launched University in Singapore) and am majoring in Electrical Power Engineering. My current final year project requires me to research on BS1363 and try to reduce the amount of copper usage as we know that the copper consumption in the world is getting larger and that copper is a natural resource hence it could be said that it has a finite quantity.

I am trying to find out the contact resistance = Constriction Resistanc + Filmic Resistance. I do have the formulae available but I do not know what is the radius of the metal to metal contact part.

I do not quite know where can I head to towards designing of a new plug to alleviate the copper usage.

Many would say that it's redundant to work on this project but it seems that I do not have a choice but to only work on it. I'm not trying to do something illegally if that's what you're thinking.

If anyone could help, please. I've been working on this for the past 8 weeks with no results.

Any papers/forums/journals/articles/teaching are deeply appreciated.

Thanks in advance!

See if you can find anything in Google Scholar.
IEEE and IEE (and other journals)may have papers, your university library may be able to obtain copies of papers at no cost to you. If work was done in this field, much of it could go back some years, since the contact resistance problem is not new.
Some of the work may have been done empirically by manufacturing companies, if there is such a company operating near you, see if they can help.
Good luck,
Richard

This resistance will be for most purposes negligible. Due to manufacturing tolerances and practical things like variable contact pressure, corrosion and dirt and bent contacts on things, I would expect the actual contact areas and resultant resistance values to vary greatly within a small range, making theoretical calculations of little use !

You will need an accurate ohmmeter to measure actual resistances. (That is, expensive multimeter or LCR meter.)

I will second Richard's idea of consulting relevant manufacturers, who will often be pleased to help students.

Plug design: very simply, smaller will be better, taking into account issues of practical handling and safety. (As you already know) higher voltages transmit power with less current, thus utilising smaller wires. (But greater requirement for insulation.)