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Dwarves' Earth Treasures Online Museum:
Delaware Datolites found by JA
Delaware Mine, Delaware, Keweenaw Co., Michigan

Field-collecting Status: Piles mostly gone, collect at one's own risk
(Few people had been kicked off the mine dumps)

    I hadn't had luck of finding any datolites until August 2003 when I started finding small gray to white datolites "marbles" from one location. Over time I started exploring the mine dumps and noticed that the datolites are found in groups (pods). That tells me that each time the miners hit on a datolite seam, they would mine them out and dump them in one place. If they hit another seam, they take them out and dump them in a different place. The datolites usually spread out if going down a slope. After exploring and collecting, it seemed that the Delaware Mine may had at least six different seams of datolites (datolite "Marbles", colorful datolites, dark rimmed red datolites, opaque datolites, white-pinkish datolites, and white-rimmed red datolites). There had been stories of datolite-miners (like John Peoria and his father) digging into the mine dumps when it was freezing since ice prevent rocks from caving in.
    At August 2005, I finally found five colored datolites (red and orange) at one location, and I could have found more if it hasn't started raining. I came back to the Delaware Mine in August 2006 only to discover that two of my favorite "spots" had been buried by all of the excessive bulldozing and I was a little upset. I know they were trying to find the pod of red datolites, but I don't like the way it was bulldozed. It's my personal opinion that they should had bulldozed the rocks away from the mine, NOT toward it so to keep any materials below exposed for further bulldozing. In spite of this setback, I continued exploring around trying to re-discover my favorite spots and found two large ones in plain sight. As of August 2007, I found only two "marbles" and the datolites seem to be scattered randomly due to too much bulldozing. I finally hit on a spot in August 2008 where I was able to find a good number of colorful datolites including Cherry Red, Citrus Orange and Lemon Yellow ones! I took only a glance at the piles on August 2010 and found only few small datolites and the next day, the people found themselves unable to find enough datolites. So the mine may be running out of datolites. But as of August 2013, I was surprised to find some datolites there and I found only two (white and yolk yellow) in August 2015. As of August 2016, the rock piles are being crushed and hauled away for use on the lumbering roads. It's still possible to find some datolites from time to time due to weathering or rocks being hauled away for various purposes.

map
You can click on the pictures to see larger pictures.


datolite

datolite

August 2008 Extracted From a single rock,
August 2018
datolite datolite datolite
Cherry Red Datolite, August 2008 Citrus Orange Datolite,
August 2008
Lemon Yellow Datolite
August 2008
datolite datolite datolite
Mult-chambered red datolite
August 2008
Red with White rims, August 2008 Peach Colored, August 2008

datolite
datolite datolite
Typical white nodule but with interesting patterns,
from Datolite "Marble" site, buried by 2006 bulldozing
August 2004
Classic Pink datolites
August 2005
Classic Red datolites
August 2005
datolite datolite datolite
Datolite "Marbles"
August 2004
Gray Datolite "marble"
August 2006
Grayish (purplish?) datolite,
August 2006
datolite datolite datolite
One of  my largest datolites found so far,
red dots
August 2006
One of my largest datolites found so far
August 2006
Classic Red colors
datolite datolite datolite
Faint peach color, August 2009 Faint peach color, August 2009 Red dotted white datolite, August 2009
datolite datolite
August 2013, a surprise find.
August 2013 Yolk Yellow color
August 2015

datolite

datolite

datolite

August 2018
August 2018 August 2019

datolite

datolite



August 2019
August 2021
(didn't go to UP of Michigan in 2020)