评论来自 THEGMoD

It would appear that these plans may be required to "Repair" the mine at the garrison. Whether your mine will start in a damage state and need to be repaired before it yields any benefit, or otherwise, is unknown as of right now.

评论来自 Mertens

If you already mined your ore that day, additional nodes will spawn after performing the upgrade to level 2

评论来自 PPSF

As for now it appears you can only get these plans by paying the gold.

评论来自 stickshift

You'll want to click on the purchased blueprint, then do the same with your architect table. You'll see your excavation site with a green arrow showing it's ready to be upgraded to lvl 2. If you have 300 gold and 50 garrison resources on hand you can click on the Upgrade button in the upper left-hand corner of your table. A little pop-up will appear to confirm this and once you do, it's a one hour wait before it's ready to mine.

Note: Once this is done, you can't go in and mine the ores that popped at lvl 1 because the entrance is temporarily boarded-up. So make sure to empty it out first if the daily reset is looming.

评论来自 Stompa

Upgrading to the Level 2 mine is well worth it. Although you may not think you need more ore (especially if mining doesn't directly support your professions) there are a number of other advantages that the tooltip doesn't really capture.

The tooltip:

Allows followers with the mining trait to work here: the bonus granted is that 矿车 will now appear in your mine. These contain a number of useful items including 原始之灵, 矿工咖啡, and 加工过的采矿锄. Carts can also contain Archaeology fragments.
Also opens a new mineshaft: there are of course more nodes to mine, but there are also bigger and richer nodes. You will now find rich deposits (富真铁矿脉 and 富黑石矿脉) which drop higher quantities of ore and 德拉诺岩石.

Either way - upgrading the mine is a good idea!

评论来自 BellaD

Can you upgrade the excavation if it is not a primary TS on a alt ?

评论来自 Eido

BUILDING/ZONE	REQUIREMENTS/PLANS	CONTAINS
Level 1, Zone (A/H)	Level 92 + Quest (A/H)	Only contains mining nodes.
Level 2, Zone (A/H)	No level requirement. Quest Chain (A/H) + Plans (A/H)	Mine Carts (spell) become active.* More mining nodes and more work orders.
Level 3, Zone (A/H)	Level 100 + Achievement + Plans (A/H)	More mining nodes and more work orders.

*Despite the tooltip, you currently do not need to have any follower assigned to have access to 矿车s.
This means the only current benefit to having a follower with the 采矿 trait assigned to your mine is higher work order yields (affected by follower level).

OTHER INFORMATION

The ability to mine ore within these garrison mines does not required the 采矿 profession.
The only benefit to having the 采矿 profession is the ability to mine ore OUTSIDE of your garrison. (Same goes with 草药学).