What is this- and why is it leaking?

So an oil change was going to be done.
Car is jacked up- while its at an angle oil comes pouring out.
We put the car back down- and try to figure out what just happened.
This fluid is not engine oil. though it is a bit dark.
We trace it back to this area. in the picture we can see the serpentine belt. we can also see some of the fluid on the hose.
Why did it leak so suddenly? Did we jack up the car from the wrong place?

From your pic, I can't really tell what you're referring to.  I see some dirt around the valve cover, which is normal, and some oil smudges on the mm bracket, which isn't abnormal.
Can you identify the fluid your seeing?  Could it be PS or brake fluid? 
It could just be some dirty water that got trapped under there too.  I've seen that before in my own car.
 
 

im sorry...
Im referring to the metallic colored brace- it has that  circular rubber thing in the middle and 2 bolts/nuts coming out of it.
I used my fingers and paper towel and it is not water. I thought power steering fluid... but its level is still ok in the reservoir.
It is definitely coming out of the bottom of this bracket/rubber circle thing.

i just reread your post virgin1.  mm bracket. I guess it is a motor mount bracket.

That's where the power steering motor and pump are located.  If the level is OK, maybe it was over full.  I had that happen to mine once also after jacking up the car.  Mine has been OK ever since.
Keep an eye on it, but I wouldn't worry too much about it either.
BTW, and for your own information, that bracket and round rubber thingy is your #3 engine mount assem... just so you know. 
 
 

Saw your message about the PS pump being located in that area.
With engine running we turned the wheels left and right.
You can hear the pump work as the wheels are turned. But no leak from the pump or the pumps reservoir.
The fluid/oil definitely came from the bottom of this mount.
Are the mounts fluid filled?

Not to my knowledge.  I believe they are a simple rubber bushing....
 
 

update.
 
car was taken to dealer.
#3 mount was leaking oil/fluid.
it was replaced under warranty.

Hey!! Good info, and thanks for posting it, rbarrios!!  I did not know that the mounts, or THAT mount was oil filled before.
Did you notice a rough idle or running after it leaked, or any changes at all?
 
I wonder now if that's what I was seeing that time?  But I have a hard rear mount (#1) in so I get some vibration anyway. 
 
 

No, didnt notice any change. just the spilled oil.
Maybe it had not spilled all of its oil.

I asked a member of our local Mazda3 chapter who also owns an '04 HB and AutoX's on a regular basis said that his has gone bad several times already.  He runs stock mounts all around(?). His 3rd mount was replaced twice while in warranty and now has gone bad again.  He said that when his goes bad it's like "night and day."  Because I already have the sturdier 1st place mount, I can't tell as easily. He is looking into the SU (Street Unit) polyurethane mounts for the 3rd and 4th positions, as I am. 
I have again written to asked SU if they are ready for the market and am awaiting an answer. They were in a pilot (test) mode w/several other owners to help work out any bugs.  Originally they had hoped to release them to the general public in late February, but fitment issues have plagued them... one I'm sure they will solve soon.
New release date...?
When they do, I will be in the first 50 owners to have them. I was actually signed up and going to go this way before I knew I had the same problem as you have experienced. 
I will post again (after they have broken in) with pictures, install intructions and an update.
 
Thanks again for your input, rbarrios.  It's a big help to all of us new gen Mazda owners.