This quest can be started from Exquisitely Crafted Brooch item (not on wowhead right now).
It is random drop from any Monelite Seam node after you have Rank 2 and certain skill level.
The best place for me was the Tiragarde Sound, near the Castaway Point windrider.
The Monelite Seam nodes are usually in caves or sometimes in rivers, but i prefere to target caves..
An Exquisite Brooch video: https://www.youtube.com/watch?v=EXI5gBbkLYw
All the BfA Horde Mining Zandalari Mining quests:
Id
Quest
Skill
Questgiver
Zone
Video
1
50
[npc=122694]
Zuldazar
https://youtu.be/XVNnN8jXEb8
2
150
[npc=122694]
Zuldazar
https://youtu.be/7LFQjnIFgng
3
50
[object=276619] Rank 2
[npc=122694]
Zuldazar
https://youtu.be/ZK4NRhu8peI
4
150
[object=276619] Rank 3
Exquisitely Crafted Brooch
Node Drop Item
https://youtu.be/EXI5gBbkLYw
5
50
[npc=122694]
World
https://youtu.be/gxaEgoTbI7s
6
150
[npc=122694]
World
https://youtu.be/Ld3lsLXSxGU
7
150
[object=276620] Rank 2
[npc=122694]
Zuldazar
https://youtu.be/1su0_dhfnjw
8
150
[object=276620]
[npc=122694]
Zuldazar
https://youtu.be/nm4zsqCd9ZU
9
150
[object=276620] Rank 3
[npc=139634]
Zuldazar
https://youtu.be/msQ-rY4iC-w
10
130
[item=161078]
Node Drop Item
https://youtu.be/_zk1oQ6H2m0
11
150
[item=161088]
Node Drop Item
https://youtu.be/1birOJOMbS4
12
150
[npc=139792]
Stormsong*
https://youtu.be/LkGCU1Q-vbc
Skill column is approximate level you need to have to get this quest. It can be lower, i provide here info of level i was able to pick up the quest.
* Drop items can drop from related herb in multiple zones. Farm the herb in any zone you want. I provide the recommended zone.
Alliance questchain is here: [spell=265852]