I would try The University of Oregon Geochron lab. http://geochronology.coas.oregonstate.edu/about-us/

We have had very good results working with them.

Dear Matthew,

Thanks for your recommendation. I have just visited the web page you sent to me, but do not know how to contact a  research collaborator in this lab.  The results would be used to publish high quality papers.  Currently,  I have published four papers from the unconsolidated alluvial placers found in the western part of the Mamfe Basin. The recent paper  entitled "U-Pb Ages for Zircon Grains from Nsanaragati Alluvial Gem Placers: Its Correlation to the Source Rocks"   was submitted to the Resource Geology Journal  for its publication. It would be published by April 2015.

If you are interested we can start the collaboration.

Best regards

Dr. KANOUO

Contact Dan Miggins directly...

http://ceoas.oregonstate.edu/profile/miggins/

Dear Matthew 

I have just sent a mail to Dr. Dan Miggins

I hope that he would send a positive reply to me.

Cordially

You are welcome to contact me about the analyses. We perform U/Pb and trace element concentration measurements simultaneously via split stream ICPMS. You can find out more about our laboratory here: https://sites.google.com/site/icpgeolucsb/

As far as I know, the OSU lab linked above, in the previous reply, perform Ar/Ar analyses, whereas it sounds like you need U/Pb analyses.

Dear Dr. Sylvestre,

You should contact Dr. Eric Roberts at James Cook University. JCU has a zircon lab and Dr. Roberts and his colleagues and students have extensive experience collecting and dating zircons from Africa (mainly western rift systems and South Africa). His email is [email protected] 

Lab related details (costs, sample sizes, etc.) should be forwarded to Dr. Cassian Pirrard at [email protected]

Hope this helps,

Nathan English

Dear John Cottle

Good morning 

Thanks for your message. I would be happy to establish a fruitful research collaboration with you and your laboratory.  I hope to carry laboratory analyses in your University.  We are going to publish high quality papers. My speciality is exploration and genetic study of ore deposits. During my Ph.D research work, I study placers, lithified clasts, igneous and metamorphic rocks ( see the table of content of my Thesis : attached file). If possible, you can send your E-mail contact to me. I would send my CV and published papers to you. You can send to this contact: [email protected].

Cordially

Dr. KANOUO