Best Place for Silver Vein?

What's the best place for Silver Vein other than the 10min place once per day?

Anywhere where there is a pure spawn of enemies with levels that end in a 0 or 1. World map would reveal the rest.

Edit: the Blue Robo maps in Ludi seem good, 5 maps of pure spawn level 61 enemies. Bear in mind nowhere will be anywhere near as fast as the mine.

A mule at the once-a-day mine.

Make mule, mine at the 10min secret place. Repeat if you need more.