How literal is this phrase?

Sample examples at http://tinyurl.com/is-it-lit

gold mine:

Definitions:

  1. a good source of something that is desired
  2. a mine where gold ore is found

Examples:

  1. Gardeners Watching Gordon Taylor and Guy Cooper in action is like stumbling across a TV gold mine ! Apart from their instant star appeal , this is a funny and charming duo
  2. demand for locomotives in South Africa , which was extremely high at the time with gold mines being sunk in the Free State Gold Field and the discovery of the Evander Gold
  3. to optimise the potential of our combined UK dealer network , which is a true gold mine . European distribution is now centralised in Lausanne and there are now one national import
  4. . In single-space typescript it runs to over 4,000 pages . It is a veritable gold mine of sociological , political , and cultural material . He is teaching an Honours module
  5. investor must make Broadband is worth waiting for Africa 's natural resources are a potential gold mine The Week In Review : Do n't trample all over Carpetright Tricycle Theatre , Winter

Step 1: Select the definition of gold mine which occurs most of the times in the above examples. Ignore other definitions.

Definition1 Definition2

Note: Please select the answers below carefully based on the definition which occurs frequently in the examples

Step 3: score of 0-5 for how literal is the use of "mine" in the phrase "gold mine"
0 1 2 3 4 5

Please provide any comments in case you want to tell us about your judgement or any other queries/suggestions! Not Mandatory but helpful.