Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_630 ( "Client" text, "Years of Operation" text, "Area of Operation" text, "Country" text, "Services" text )

### Question ###
Whose address of operation was the Echirax Concession?

### Accurate SQL ###

SELECT "Client" FROM table_630 WHERE "Area of Operation" = 'EchiraX Concession'